Question 1

Consider a culture medium on which only gram-positive organisms such as Staphylococcus aureus colonies can grow due to an elevated NaCl level. A yellow halo surrounds the growth, indicating the bacterium fermented a sugar in the medium, decreasing the pH as a result and changing the color of a pH indicator chemical. This type of medium would be referred to as a(n)?

Accepted Answer

Answer reason: Selective media contain inhibitory substances (e.g., high NaCl) that suppress many organisms while allowing certain groups, such as salt-tolerant gram-positive staphylococci, to grow. Differential media include substrates and indicators (e.g., fermentable sugar plus a pH indicator) that reveal metabolic differences by a visible change such as a yellow halo from acid production. This stem describes both growth selection by elevated salt and differentiation by color change with fermentation. Enrichment culture is intended to increase numbers of a desired organism in a mixed sample (often liquid) rather than providing an indicator-based visual differentiation on solid media.

Question 2

Which of the following statements about substrate-level phosphorylation is FALSE?

Accepted Answer

Answer reason: Substrate-level phosphorylation generates ATP by directly transferring a phosphate from a phosphorylated metabolic intermediate to ADP, without relying on an electron transport chain. In contrast, capturing energy from oxidation of intermediates to drive ATP synthesis via a proton gradient describes oxidative phosphorylation, which requires electron carriers and a terminal electron acceptor. The other statements align with substrate-level phosphorylation: it occurs in glycolysis and can occur in the Krebs cycle (e.g., succinyl-CoA synthetase), and it does not require a terminal electron acceptor. Therefore this option is the false description of substrate-level phosphorylation.

Question 3

Which of the following regarding antimicrobial control agents is FALSE?

Accepted Answer

Answer reason: Antimicrobial control efficacy varies by organism structure and resistance mechanisms, so no single agent is universally and equally effective across bacteria and viruses. Many disinfectants/antiseptics have reduced activity against non-enveloped viruses compared with vegetative bacteria because viral capsids can be more chemically resilient than bacterial membranes. In addition, factors like concentration, contact time, and presence of organic material change performance and make “equal effectiveness” an invalid generalization. The other statements describe well-established mechanisms or real-world limitations of antiseptics/disinfectants and are therefore not false.

Question 4

The first step for directly linking a microbe to a specific disease according to Koch's postulates is to?

Accepted Answer

Answer reason: Koch’s postulates begin by establishing an association between the suspected pathogen and the disease, which requires collecting material from an infected host. The initial practical step is to obtain a specimen from the diseased animal so the organism can then be detected and subsequently isolated in pure culture. Steps like culturing on nutrient media or inoculating a healthy animal occur after specimen collection. Options involving sampling healthy animals or simple comparison without isolation/inoculation do not follow the structured sequence required to prove causation.

Question 5

In which of the following situations would Koch's postulates be utilized?

Accepted Answer

Answer reason: They guide investigators in isolating the suspected pathogen from diseased hosts, growing it in pure culture, reproducing disease after inoculation into a healthy host, and re-isolating the same organism. This directly fits scenarios where scientists are trying to prove which microbe is responsible for a newly emerging infectious illness. In contrast, antibiotic or vaccine development are downstream applications after a causative organism is already known, and cancer etiology is not typically established by Koch’s postulates.

Question 6

In mid-December, a woman with insulin-dependent diabetes who had been on prednisone fell and received an abrasion on the dorsal side of her right hand. She was placed on penicillin. By the end of January, the ulcer had not healed, and she was referred to a plastic surgeon. On January 30, a swab of the wound was cultured at 35°C on blood agar. On the same day, a smear was made for Gram staining. The Gram stain showed large (10 µm) cells. Brownish, waxy colonies grew on the blood agar. Slide cultures set up on February 1 and incubated at 25°C showed septate hyphae and single conidia. The most likely cause of the infection is a?

Accepted Answer

Answer reason: Thermally dimorphic fungi characteristically grow as molds with septate hyphae and conidia at ~25°C and convert to larger yeast-like forms in tissues/at 35–37°C. The lab findings explicitly show large (~10 µm) cells on Gram stain at body temperature conditions and septate hyphae with single conidia at 25°C, matching this temperature-dependent morphology switch. Brownish, waxy colonies further support a fungal rather than typical bacterial process, especially with failure to respond to penicillin. Diabetes and prednisone increase susceptibility to subacute/chronic fungal wound infections, making this organism class the best fit versus bacteria, protozoa, or a simple yeast that would not form septate hyphae.

Question 7

Assume you inoculated 100 cells, with a generation time of 20 minutes, into 100 ml of nutrient broth. You then inoculated 100 cells of the same species into 200 ml of nutrient broth. After incubating for 4 hours, you can reasonably expect to have?

Accepted Answer

Answer reason: Bacterial population growth in exponential phase depends on the initial inoculum and the number of generations completed, assuming nutrients are not limiting and other conditions are equivalent. Both cultures start with the same number of cells (100) and have the same generation time (20 minutes), so over 4 hours (240 minutes) they undergo the same number of doublings (240/20 = 12). Thus, each culture will reach the same cell count (100 × 2^12) even though the final concentration (cells/mL) would be lower in the larger volume. Choosing the larger volume as having more cells confuses total cell number with density, and the scenario provides no limiting-factor data to change the exponential assumption.

Question 8

The client being seen in a clinic relates a history of just returning on a flight from El Salvador after going mountain climbing. The client is diagnosed by the HCP as having giardiasis. Which conclusion should the nurse make regarding how the client most likely contracted the infection?

Accepted Answer

Answer reason: Giardia duodenalis is typically transmitted by the fecal–oral route through ingestion of cysts in contaminated water or food. Travel-associated giardiasis most commonly results from consuming untreated water, ice, raw produce, or foods handled with poor hygiene. Close contact on an airplane is more consistent with droplet/airborne pathogens rather than an intestinal protozoan spread via ingestion. Vaccinations do not cause giardiasis, and “mountain climbing” alone is not the exposure unless it involved drinking untreated surface water, which is best captured by contaminated food/beverage ingestion.

Question 9

The Pap test for cervical cancer involves microscopic examination of cervical cells for cancerous cells. A new, rapid diagnostic test to detect human papilloma virus (HPV) DNA before cancer develops is done without microscopic exam. The steps involved in this FastHPV test are listed below. What is the second step?

Accepted Answer

Answer reason: This test is a nucleic-acid hybridization assay, where the target HPV DNA must first be released and then specifically bound by a complementary probe. After cell lysis releases and exposes the DNA, the next essential step is hybridization by adding an RNA probe that will base-pair with any HPV DNA present to form DNA–RNA hybrids. Only after these hybrids exist can an enzyme-linked antibody directed against DNA–RNA hybrids bind for detection, and the substrate is added last to generate a measurable signal. The order is therefore critical because downstream detection depends on successful probe hybridization.

Question 10

A 38-year-old man had onset of fever, chills, nausea, and myalgia while vacationing on the Gulf of Mexico. On April 29, he had eaten raw oysters and gone wading in the warm coastal waters. On May 2, he was admitted to a hospital because of a fever of 39°C and two circular necrotic lesions on the left leg. He had a history of alcoholic liver disease. He was transferred to the ICU; therapy with antibiotics was initiated. On May 4, he died. Which of the following is the most likely cause?

Accepted Answer

Answer reason: This organism is classically associated with rapidly progressive cellulitis with hemorrhagic bullae/necrosis and high mortality, especially in patients with chronic liver disease. The timeline of abrupt systemic symptoms followed by necrotic skin lesions and rapid deterioration despite antibiotics aligns with fulminant Vibrio septicemia/necrotizing infection. Other choices more typically cause gastroenteritis (Bacillus cereus), prolonged watery diarrhea (Cyclospora), enteric fever (Salmonella typhi), or chronic hepatitis without acute necrotic skin lesions (hepatitis C virus).

Question 11

Which of the following correctly lists the stages of tooth decay?

Accepted Answer

Answer reason: The process begins with plaque biofilm formation, then initial enamel demineralization and breakdown, followed by further spread through enamel into deeper structures. Once the lesion reaches dentin, progression accelerates because dentin is less mineralized and has tubules that facilitate spread. Pulp involvement occurs last, when infection/inflammation extends through dentin to the pulp, causing pulpitis and potential abscess.

Question 12

A physician diagnoses a patient with lepromatous Hansen's disease. All of the following pertain to the patient EXCEPT?

Accepted Answer

Answer reason: Lepromatous Hansen disease is caused by Mycobacterium leprae and requires prolonged multidrug antimycobacterial therapy rather than beta-lactam antibiotics. Recommended regimens classically include agents such as dapsone and rifampin (often with clofazimine), which target mycobacterial physiology and reduce resistance. Penicillin does not have reliable activity against M. leprae and is not a standard or effective treatment choice. The other options describe typical features or evaluation of lepromatous disease, including diffuse nodular lesions, diagnosis supported by skin biopsy, and transmission associated with prolonged close contact.

Question 13

In one hospital, Pseudomonas aeruginosa serotype 10 infected the biliary tract of 10 percent of 1300 patients who underwent gastrointestinal endoscopic procedures. After each use, endoscopes were washed with an automatic reprocessor that flushed detergent and glutaraldehyde through the endoscopes, followed by a tap water rinse. P. aeruginosa serotype 10 was not isolated from the detergent, glutaraldehyde, or tap water. What was the source of the infections?

Accepted Answer

Answer reason: A biofilm within the internal tubing/chambers of an automatic reprocessor can intermittently seed endoscopes even when spot cultures of detergent, disinfectant, and tap water are negative. Glutaraldehyde is effective against planktonic bacteria, but organisms embedded in biofilm matrix are more protected and harder to eradicate without thorough mechanical cleaning and maintenance of the reprocessor. This best explains a hospital-wide cluster linked to a shared processing device, whereas a truly contaminated disinfectant would more likely yield a positive culture from the solution.

Question 14

Three weeks after a river rafting trip, three family members experienced symptoms of coughing, fever, and chest pain. During the rafting trip, the family had consumed crayfish that they caught along the river banks. An examination of the patients' sputum revealed helminth eggs, and serum samples were positive for antibodies to Paragonimus. All of the family members recovered following treatment with praziquantel. In the Paragonimus life cycle,?

Accepted Answer

Answer reason: Definitive hosts are where sexual reproduction and adult flukes reside, while intermediate hosts harbor larval stages. Paragonimus (lung fluke) infects humans after ingestion of encysted metacercariae in undercooked freshwater crustaceans such as crayfish. Humans then develop adult flukes in the lungs and can pass eggs that may be found in sputum, matching the presentation. River water exposure alone is less consistent because the key infectious stage for humans is acquired via eating the intermediate host rather than direct water ingestion.

Question 15

Seventeen patients in ten hospitals had cutaneous infections caused by Rhizopus. In all seventeen patients, Elastoplast bandages were placed over sterile gauze pads to cover wounds. Fourteen of the patients had surgical wounds, two had venous line insertion sites and one had a bite wound. Lesions present when the bandages were removed ranged from vesiculopustular eruptions to ulcerations and skin necrosis requiring debridement. Fungi are more likely than bacteria to contaminate bandages because they?

Accepted Answer

Answer reason: Fungal spores and many molds are relatively desiccation-tolerant and can persist on dry, inanimate materials, making contaminated adhesive bandages a plausible reservoir. In contrast, many bacteria require higher water activity and survive less well as surfaces dry, so they are less likely to persist on bandage materials over time. The outbreak context (Rhizopus, a mold) aligns with environmental survival via spores that remain viable under low moisture. Aerobic growth is not distinguishing because many clinically relevant bacteria are also aerobic or facultative, and the other options do not explain enhanced survival on dry bandages.

Question 16

Which of the following infections is an airborne viral infection?

Accepted Answer

Answer reason: It primarily infects the respiratory epithelium and is a common cause of seasonal outbreaks with person-to-person respiratory spread. In contrast, diphtheria, streptococcal sore throat, and whooping cough are typically bacterial infections (Corynebacterium diphtheriae, Group A Streptococcus, and Bordetella pertussis), so they do not fit the “viral” criterion. Therefore, the only option that matches both viral etiology and respiratory airborne spread is the influenza virus.

Question 17

Trichomonal infection is caused by?

Accepted Answer

Answer reason: The organism is a single-celled eukaryote, which places it in the protozoa category rather than bacteria or fungi. Yeast and fungus choices point more toward candidiasis, which typically causes thick, curdy discharge and is not due to a protozoan. Recognizing the causative organism type helps guide appropriate therapy, as trichomoniasis is treated with antiprotozoal agents (e.g., nitroimidazoles) rather than antibacterial or antifungal regimens.

Question 18

A mother asks the nurse, “How did my children get pinworms?” The nurse explains that pinworms are most commonly spread by which of the following when contaminated?

Accepted Answer

Answer reason: Hand-to-mouth behavior in children makes this route the most efficient and most common mode of spread in households and schools. Strict hand hygiene and trimming nails reduce autoinoculation and transmission to others. Food and fomites (e.g., toilet seats) can be secondary vehicles, but they typically become contaminated through inadequate hand hygiene. Animals are not a usual reservoir for human pinworm infection.

Question 19

What is the primary mechanism by which self-disinfecting surfaces, enabled by nanomaterial coatings, continuously kill microbes over an extended period?

Accepted Answer

Answer reason: Nanomaterial coatings can be engineered as reservoirs or matrices that slowly elute ions or biocides (e.g., silver, copper, quaternary ammonium compounds), maintaining inhibitory concentrations for extended periods. This directly matches the idea of “continuously” killing microbes without requiring a single external trigger. In contrast, photocatalysis typically depends on ongoing light exposure, making it less reliably continuous in varied real-world lighting conditions. Membrane disruption describes an effect of some agents, but it is not the overarching mechanism that explains prolonged activity without depletion control.

Question 20

Route of injecting shick test toxin/ purified protein derivative is ...?

Accepted Answer

Answer reason: Intradermal injection places the antigen within the dermis where delayed-type hypersensitivity reactions produce a palpable wheal/induration suitable for reading. Subcutaneous or intramuscular routes disperse antigen too deeply, reducing the characteristic localized reaction and making interpretation unreliable. Intravascular administration is inappropriate and unsafe for these diagnostic skin tests.

Question 21

Needle stick injury can result in all of following except?

Accepted Answer

Answer reason: HIV, HBV, and HCV are classic occupational bloodborne infections with well-established post-exposure protocols and documented transmission risk after sharps injuries. Malaria is typically transmitted by Anopheles mosquito bites rather than routine occupational needlestick exposure, making it the exception in standard infection-control teaching. While rare transfusion- or needle-related malaria transmission has been reported, it is not the expected or commonly tested outcome compared with viral hepatitis and HIV.

Question 22

Which advanced disinfection technique leverages the unique properties of cold atmospheric plasma to effectively inactivate a broad spectrum of pathogens, including antibiotic-resistant bacteria?

Accepted Answer

Answer reason: This multi-target mechanism is effective across bacteria (including resistant strains), viruses, and fungi, and it reduces the likelihood that typical antibiotic-resistance mechanisms will confer protection. The stem explicitly asks for the method that uses cold atmospheric plasma itself, making the match direct. Ozone generation and photocatalytic oxidation can disinfect via oxidant chemistry but do not specifically rely on plasma as the primary modality in the way described. Pulsed electric fields mainly disrupt cell membranes in certain applications and is not the defining technique of cold atmospheric plasma disinfection.

Question 23

Most common type of plague is...?

Accepted Answer

Answer reason: This produces the classic painful, swollen “bubo,” making this form the most frequent clinical manifestation. The pneumonic form is less common but is highly contagious via respiratory droplets and is often a complication of untreated infection or primary inhalational exposure. Septicemic disease can occur primarily or secondarily, but it is not the most common presentation compared with lymph node–predominant disease.

Question 24

Which is a common symptom of covid-19?

Accepted Answer

Answer reason: COVID-19 frequently presents with fever along with other respiratory and constitutional symptoms, making it a classic and high-yield symptom to recognize. In contrast, dry eyes is not a typical primary presentation and would be more associated with local ocular irritation rather than systemic infection. Night sweats can occur with various infections but is less characteristic as a common presenting feature compared with fever. Hair loss is more consistent with a later/post-infectious effect (e.g., telogen effluvium) rather than an acute common symptom.

Question 25

Hepatitis virus that spreads by fecal-oral route?

Accepted Answer

Answer reason: This pattern matches HAV, which commonly causes outbreaks linked to sanitation and is preventable with vaccination and hygiene measures. In contrast, HBV, HCV, and HDV are primarily bloodborne (parenteral) and/or transmitted sexually or perinatally, not by typical fecal–oral spread. Therefore, the option aligned with the classic transmission route is the one associated with enteric spread.

Question 26

Expanded form of SARS is ?

Accepted Answer

Answer reason: “Acute” differentiates it from chronic processes and matches the clinical course of the outbreak illness. Options using “acquired” are incorrect because SARS is not named as an acquired syndrome (unlike AIDS terminology). Options mentioning “reproductive” misidentify the organ system involved and are therefore inconsistent with the disease’s presentation and epidemiology.

Question 27

Which of the following emerging technologies has shown promise in enhancing the effectiveness of air disinfection systems by targeting the inactivation of airborne viruses?

Accepted Answer

Answer reason: Air-disinfection methods that inactivate viruses typically rely on oxidative chemistry that damages viral proteins, lipids, and nucleic acids, reducing infectivity. Continuous catalytic oxidation can generate reactive oxidizing species on catalytic surfaces and has been studied as an air-treatment approach aimed at microbial/viral inactivation rather than just physical removal. By contrast, charge-based precipitation and trapping membranes primarily remove particles from air, but removal does not inherently ensure viral inactivation and can create contaminated collection surfaces requiring handling controls. The quantum-tunneling phrasing is not a standard, established air-disinfection technology in the infection-control literature compared with catalytic/photocatalytic oxidation approaches.

Question 28

Smallpox vaccine was introduced by?

Accepted Answer

Answer reason: Jenner demonstrated that inoculation with cowpox could protect against smallpox, establishing the first successful vaccine concept. Pasteur later developed vaccines for other diseases (e.g., rabies) but did not introduce the smallpox vaccine. Koch and Ehrlich are primarily associated with bacteriology and chemotherapy/immunology concepts rather than the first smallpox vaccination.

Question 29

A child presents to the emergency department with a rash that started on their face and neck and has since spread to the rest of their body. What condition should the nurse suspect?

Accepted Answer

Answer reason: That face-to-body progression is a key distinguishing pattern used to recognize measles clinically. Parvovirus B19 typically presents with “slapped cheek” erythema followed by a lacy body rash rather than a straightforward cephalocaudal spread. Rubella also starts on the face but is usually milder and shorter in duration, so the classic described progression most strongly supports measles.

Question 30

BCG vaccine is giving for?

Accepted Answer

Answer reason: The other listed diseases have different vaccines (e.g., cholera oral vaccines, typhoid Vi or live oral Ty21a, tetanus toxoid) and are not targeted by BCG. The stem asks the primary indication of BCG rather than treatment or post-exposure management. Therefore the option matching the vaccine’s intended protection is the one related to tuberculosis.

Question 31

Schick Test is to detect for _____?

Accepted Answer

Answer reason: The Schick test assesses susceptibility to diphtheria by intradermally injecting a small amount of diphtheria toxin and observing for a localized reaction. A positive reaction indicates the person lacks protective antitoxin antibodies (not immune), while a negative reaction suggests immunity. This is a classic immunologic/microbiologic test tied specifically to Corynebacterium diphtheriae toxin-mediated disease. In contrast, typhoid and dengue are not evaluated by intradermal toxin-antitoxin skin testing, and tuberculosis screening uses the tuberculin skin test (Mantoux), not the Schick test.

Question 32

A parent reports to the nurse that their child is experiencing severe anal itching which is worse at night. What condition does the nurse expect the child has?

Accepted Answer

Answer reason: This symptom pattern is far more specific than generalized itching from arthropod infestations. Scabies typically causes intense pruritus that is often worse at night but is classically distributed in interdigital webs, wrists, axillae, waistline, and genital areas rather than isolated anal itching as the primary complaint. Pediculosis capitis primarily causes scalp pruritus, not perianal symptoms.

Question 33

Which of the following is NOT found or observed to occur in both mitochondria and prokaryotes?

Accepted Answer

Answer reason: Mitochondria share several features with prokaryotes, including circular DNA, 70S ribosomes, binary fission–like replication, and ATP generation via electron transport. However, mitochondria do not have a cell wall, whereas many prokaryotes do, making this the correct answer.

Question 34

A culture medium consisting of agar, peptone, and beef heart is a?

Accepted Answer

Answer reason: A complex medium contains ingredients such as peptone and beef extract (e.g., beef heart), which are not chemically defined and vary in exact composition. These provide a rich source of nutrients for bacterial growth. In contrast, chemically defined media have exact known compositions, while selective, differential, and reducing media serve specific functional purposes beyond nutrient provision.

Question 35

DOTS is a treatment strategy for?

Accepted Answer

Answer reason: This approach is classically and most strongly associated with tuberculosis control programs, where supervised dosing reduces treatment default and limits development/transmission of drug-resistant TB. Malaria and HIV use different adherence and treatment frameworks rather than DOTS as a named global strategy. Diabetes management is chronic and behavior/medication based without a DOTS-style observed short-course regimen.

Question 36

Chronic meningitis is most commonly due to?

Accepted Answer

Answer reason: Chronic meningitis is classically caused by pathogens that produce a subacute-to-chronic basilar meningeal inflammation rather than the abrupt presentation seen in acute pyogenic disease. Mycobacterium tuberculosis is the most common and most important infectious cause worldwide, often presenting insidiously with weeks of headache, fever, weight loss, and cranial neuropathies. CSF findings typically reflect chronic infection (lymphocytic predominance, elevated protein, and low glucose), supporting this etiology. Viral causes more often produce acute aseptic meningitis with relatively preserved glucose, and typical acute bacterial meningitis presents more fulminantly rather than chronically.

Question 37

The incubation period of diphtheria is?

Accepted Answer

Answer reason: Corynebacterium diphtheriae typically causes symptomatic disease within a few days of exposure, most commonly around 2–5 days (with a broader possible range up to about 10 days). This makes the 2–5 day window the best match among the choices. The longer intervals listed are more consistent with other infections and would delay recognition and containment of a potentially toxin-mediated, rapidly progressive illness.

Question 38

The incubation period of measles is?

Accepted Answer

Answer reason: This timing reflects viral replication in the respiratory tract followed by systemic spread before clinical manifestations. Short intervals like 3–5 days are more consistent with some other acute viral illnesses and are too brief for measles. A broad 2–3 week estimate can occur to rash in some sources, but it is less precise than the commonly tested 7–14 day range.

Question 39

The Gonorrhea is caused by..?

Accepted Answer

Answer reason: This organism commonly infects mucous membranes of the urogenital tract, rectum, and pharynx and can lead to complications like PID and epididymitis. Protozoa more classically cause trichomoniasis, while fungi commonly cause candidiasis, making those distractors inconsistent with the disease’s established etiology. Recognizing the causative organism guides appropriate antibiotic therapy and partner management.

Question 40

Which test detects bacterial antigen in CSF?

Accepted Answer

Answer reason: This method can quickly support the diagnosis of acute bacterial meningitis (e.g., pneumococcus, meningococcus, Hib), especially when prior antibiotics reduce culture yield. VDRL is used to detect antibodies in neurosyphilis rather than bacterial antigens, and Mantoux is a delayed hypersensitivity skin test for tuberculosis exposure. ELISA can detect antigens or antibodies depending on assay design, but the classic bedside/rapid CSF bacterial antigen test is latex agglutination.

Question 41

Which of the following is an airborne disease?

Accepted Answer

Answer reason: Tuberculosis is transmitted person-to-person through airborne particles generated by coughing, sneezing, or speaking. In contrast, cholera and typhoid are primarily fecal–oral infections from contaminated food or water, and malaria is transmitted by the bite of infected Anopheles mosquitoes. Therefore, the only airborne disease listed is the one caused by Mycobacterium tuberculosis.

Question 42

The Mantoux test is done for diagnosis of?

Accepted Answer

Answer reason: A positive induration suggests prior exposure or infection and is used for screening/diagnostic support for TB infection in the appropriate clinical context. It is not a test for enteric fever, which is classically evaluated with cultures (or historically Widal testing). Malaria is diagnosed by blood smear/rapid antigen testing, and HIV is diagnosed with antigen/antibody assays and confirmatory tests.

Question 43

A nurse has attended a continuing education conference about seasonal influenza. Which of the following statements would indicate a correct understanding of the conference?

Accepted Answer

Answer reason: " Seasonal influenza prevention includes selecting the appropriate vaccine type based on age and contraindications. LAIV is indicated for healthy, nonpregnant people within the approved age range (commonly 2 through 49 years), making this statement consistent with standard guidance. Antiviral therapy such as oseltamivir is most effective when started as early as possible (ideally within 48 hours), so delaying to 96 hours is not correct as a general teaching point. Pregnancy is not a contraindication to inactivated influenza vaccine; in fact, it is recommended during pregnancy, while LAIV is avoided.

Question 44

Which disease is also known as Hansen’s disease?

Accepted Answer

Answer reason: The key association is peripheral neuropathy with hypoesthetic skin lesions due to nerve involvement. Syphilis is caused by Treponema pallidum, measles is a viral exanthem, and tuberculosis is typically Mycobacterium tuberculosis with primary pulmonary involvement. Therefore the only option matching the established name is the mycobacterial disease of leprosy.

Question 45

The nurse recommends a parent perform a tape test on their child. What disorder does the nurse expect the child has?

Accepted Answer

Answer reason: This directly targets the organism responsible for nocturnal perianal itching in children and confirms the diagnosis by microscopy of the tape. In contrast, cystic fibrosis is evaluated with sweat chloride testing, while intussusception and pyloric stenosis are assessed with imaging (e.g., ultrasound) based on obstructive GI symptoms. Therefore, recommending a tape test most strongly indicates suspected pinworm infection.

Question 46

Malaria is spread by what mode of transmission?

Accepted Answer

Answer reason: Plasmodium parasites are injected into humans through the bite of an infected female Anopheles mosquito. Airborne, contact, and droplet routes involve respiratory or direct/indirect physical spread and do not account for the mosquito-dependent lifecycle required for malaria. Therefore the transmission mode is classified as vector transmission.

Question 47

Most common cause of fungal meningitis is?

Accepted Answer

Answer reason: This organism commonly causes subacute meningitis in advanced HIV/AIDS and other immunosuppressed states and is a leading worldwide cause of fungal meningitis. Its thick polysaccharide capsule supports persistence in CSF and is a key virulence factor (e.g., detected by cryptococcal antigen testing). Candida more often causes bloodstream infection and catheter-related disease, while Aspergillus and Histoplasma more typically cause pulmonary/disseminated disease with meningitis being less common.

Question 48

Are filaments present in the periplasmic space?

Accepted Answer

Answer reason: Certain bacteria have periplasmic structures such as endoflagella (axial filaments) located within the periplasm, notably spirochetes, which use them for motility. This makes the presence of filaments a feature of specific organisms rather than a universal bacterial characteristic. Options claiming presence in all bacteria or never are overly absolute, and restricting it to Gram-positive is incorrect because Gram-positive organisms generally lack an outer membrane and a typical periplasmic space.

Question 49

Several family and friends reported to the emergency department with abrupt onset chills, nausea and vomiting, and abdominal pain. A few hours earlier, they attended a wedding reception dinner that served pork, chicken, and fish entrees with asparagus and potatoes, and various cream-filled pastries and custards. These individuals had no similar episode prior to this event and no significant medical illnesses. A few individuals had to be admitted for rehydration. Leftover food was collected from all prepared dishes and sent for analysis. Which of the following is the most likely causal organism?

Accepted Answer

Answer reason: The exposure to cream-filled pastries and custards strongly suggests toxin produced in food that was improperly handled or left at room temperature. This pattern contrasts with toxin-mediated watery diarrhea from meat/gravy associated with longer incubation (typically 8–16 hours) seen with certain spore-formers. The presence of chills can occur with acute gastroenteritis but the key discriminator here is the very short incubation after ingestion of custard/cream items.

Question 50

Viral meningitis is also called?

Accepted Answer

Answer reason: Viral meningitis is characterized by meningeal inflammation without identifiable pyogenic bacteria on routine Gram stain and standard bacterial culture, hence the term “aseptic.” Typical CSF findings support this concept: lymphocytic predominance with normal or mildly elevated protein and normal glucose compared with bacterial disease. “Purulent meningitis” implies a bacterial etiology with neutrophilic CSF and low glucose, making it a common distractor. Tubercular and fungal meningitis are separate infectious causes with different clinical courses and CSF profiles and are not synonymous with viral meningitis.

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