Question 1

Which of the following is a key feature distinguishing the rash of shingles from other viral rashes?

Accepted Answer

It localizes to one side of the body and does not cross the midline.

Question 2

Which virulence factor of Neisseria meningitidis allows it to evade the host immune system and persist in the bloodstream?

Accepted Answer

Polysaccharide capsule

Question 3

A patient presents with severe headache, stiff neck, and fever. Lumbar puncture reveals cloudy cerebrospinal fluid (CSF) and decreased glucose levels. Which diagnosis is most likely?

Accepted Answer

Bacterial meningitis

Question 4

Why do viruses cross the blood-brain barrier more easily than bacteria?

Accepted Answer

Viruses can travel within peripheral neurons directly to the CNS.

Question 5

Which of the following statements about the epidemiology of chickenpox and shingles is correct?

Accepted Answer

Shingles can only occur in individuals who previously had chickenpox.

Question 6

Which of the following is a major virulence factor of Streptococcus pneumoniae in causing meningitis?

Accepted Answer

Secretory IgA protease

Question 7

A patient develops fever, headache, and a petechial rash. CSF analysis shows a dramatic increase in white blood cells. Which pathogen is most likely responsible?

Accepted Answer

Neisseria meningitidis

Question 8

Which of the following best explains why postexposure prophylaxis (PEP) with active immunization is effective for rabies?

Accepted Answer

The immune response can neutralize the virus before it reaches the CNS if vaccine is given early.

Question 9

Which of the following equations correctly represents the probability $$P of $$survival after rabies exposure if PEP is administered before CNS symptoms develop, given that the fatality rate after CNS symptoms is 99.9%?

Accepted Answer

$$P = 1 - 0.999$$

Question 10

Which of the following is NOT a portal of infection for the central nervous system (CNS)?

Accepted Answer

Direct inhalation into the lungs

Question 11

Which statement about poliovirus is correct?

Accepted Answer

It is transmitted via fecal-oral route and is very stable outside the host.

Question 12

A child presents with fever and vesicular skin lesions that progress to crusting over several days. Which virus is most likely responsible?

Accepted Answer

Varicella-zoster virus (VZV)

Question 13

Which of the following is a distinguishing feature of bacterial meningitis compared to viral meningitis?

Accepted Answer

Bacterial meningitis often presents with cloudy CSF and decreased glucose.

Question 14

Which vaccine strategy is used to prevent shingles in adults over 50 years old?

Accepted Answer

Recombinant vaccine (Shingrix; RZV)

Question 15

Which of the following best describes the pathogenesis of rabies after a bite from an infected animal?

Accepted Answer

Virus replicates in muscle cells, then travels via axonal transport to the CNS.

Question 16

Which of the following is a correct statement about the latency of Varicella-Zoster Virus (VZV)?

Accepted Answer

VZV becomes latent in nerve ganglia as an episome.

Question 17

Which of the following is a major reason for the global eradication effort of poliomyelitis?

Accepted Answer

Poliovirus only infects humans and has no animal reservoirs.

Question 18

Which of the following equations represents the percentage of paralytic polio cases that result in permanent paralysis, given that 80% of paralytic cases do not recover?

Accepted Answer

$$\frac{80}{100} 	imes 100\%$$

Question 19

Which of the following is a common risk factor for viral meningitis in neonates?

Accepted Answer

Exposure to contaminated swimming pools

Microbial Diseases of the Nervous System: Meningitis, Chickenpox/Shingles, Rabies, and Poliomyelitis

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