Question 1

Which of the following best describes the function of the blood-brain barrier (BBB) in the central nervous system?

Accepted Answer

It is a specialized network of capillaries that restricts the passage of most pathogens and large molecules into the CNS.

Question 2

A patient presents with sudden onset fever, headache, and a stiff neck. A lumbar puncture is performed, and the cerebrospinal fluid (CSF) shows no bacterial growth and normal glucose levels. What is the most likely diagnosis?

Accepted Answer

Viral meningitis

Question 3

Which of the following statements about neurons is correct?

Accepted Answer

Sensory neurons transmit input from the environment to the CNS.

Question 4

Which of the following is a key virulence factor that allows Neisseria meningitidis to evade the immune system and cause meningococcal meningitis?

Accepted Answer

Capsule formation

Question 5

A 3-year-old child who has not received the Hib vaccine develops sudden fever, headache, and confusion. Which organism is most likely responsible for this infection?

Accepted Answer

Haemophilus influenzae type b

Question 6

Which of the following best explains why viral meningitis generally has a better prognosis than bacterial meningitis?

Accepted Answer

Viral meningitis is less likely to cause severe inflammation and permanent damage compared to bacterial meningitis.

Question 7

A patient develops flaccid paralysis after a recent trip to a country with low polio vaccination rates. Which of the following best describes the mechanism by which poliovirus causes this symptom?

Accepted Answer

The virus lyses motor neurons in the CNS, leading to muscle weakness and paralysis.

Question 8

Which of the following is a distinguishing feature of rabies infection compared to other viral nervous system infections?

Accepted Answer

It is almost always fatal after the onset of neurological symptoms.

Question 9

A 65-year-old immunocompromised patient develops meningitis after eating unpasteurized cheese. Which of the following best describes the pathogenesis of the likely causative agent?

Accepted Answer

It is an intracellular pathogen that escapes the phagosome and uses actin tails to move between cells.

Question 10

Which of the following best explains why humans are considered 'dead-end hosts' for West Nile virus?

Accepted Answer

Humans do not develop high enough viremia to transmit the virus back to mosquitoes.

Question 11

A patient presents with a petechial rash and rapidly progressing neurological symptoms. Which of the following is the most likely diagnosis?

Accepted Answer

Meningococcal meningitis

Question 12

Which of the following is the most common cause of bacterial meningitis in children under two years of age in the United States?

Accepted Answer

Streptococcus pneumoniae

Question 13

Which of the following best describes the mechanism by which Streptococcus pneumoniae causes damage in pneumococcal meningitis?

Accepted Answer

It produces an exotoxin that stimulates severe inflammation, leading to host tissue damage.

Question 14

A patient with a history of animal bite develops hydrophobia, pharyngeal spasms, and eventually coma. What is the most appropriate post-exposure intervention?

Accepted Answer

Administration of antirabies antibodies and inactivated rabies vaccine

Question 15

Which of the following is a key difference between the Salk and Sabin polio vaccines?

Accepted Answer

The Sabin vaccine is administered orally and can immunize others through fecal shedding.

Question 16

Which of the following best describes the role of the gut-brain axis in nervous system function?

Accepted Answer

The gut-brain axis involves communication between the GI tract and the nervous system, influencing mood and cognition.

Question 17

A patient with bacterial meningitis is treated with antibiotics, but still develops permanent hearing loss. Which of the following best explains this outcome?

Accepted Answer

The immune response to infection can cause irreversible damage to nervous tissue.

Question 18

Which of the following best explains why the nervous system is particularly vulnerable to infection and injury?

Accepted Answer

Loss of motor or sensory function in the CNS is often permanent due to the inability of nerve cells to regenerate.

Question 19

A neonate develops meningitis after birth. Which of the following pathogens is most likely responsible, and what is a key prevention strategy?

Accepted Answer

Listeria monocytogenes; avoid unpasteurized dairy products during pregnancy

Nervous System Infections: Microbiology and Clinical Principles

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