Question 1

Which of the following best describes the difference between the central nervous system (CNS) and the peripheral nervous system (PNS)?

Accepted Answer

The CNS consists of the brain and spinal cord, while the PNS includes all neural tissue outside the CNS.

Question 2

A patient presents with sudden high fever, severe headache, neck stiffness, and photophobia. Which of the following is the most likely diagnosis?

Accepted Answer

Meningitis

Question 3

Which of the following statements correctly compares bacterial, viral, and fungal meningitis?

Accepted Answer

Bacterial meningitis is generally more severe and requires immediate antibiotic treatment, while viral meningitis is often self-limiting and fungal meningitis is most common in immunocompromised patients.

Question 4

Which organism is most commonly associated with meningococcal meningitis?

Accepted Answer

Neisseria meningitidis

Question 5

A 3-year-old child presents with symptoms of meningitis. Laboratory tests reveal a Gram-negative coccobacillus. Which organism is most likely responsible?

Accepted Answer

Haemophilus influenzae type b

Question 6

Which of the following is a key distinguishing feature of cryptococcal (fungal) meningitis compared to bacterial meningitis?

Accepted Answer

It is most commonly seen in immunocompromised patients, such as those with HIV/AIDS.

Question 7

Which of the following best describes the mechanism of action of the tetanospasmin toxin produced by Clostridium tetani?

Accepted Answer

It blocks the release of inhibitory neurotransmitters, leading to sustained muscle contraction.

Question 8

Botulinum toxin is used clinically for which of the following purposes?

Accepted Answer

Reducing muscle spasticity in conditions such as cerebral palsy

Question 9

A patient presents with descending, symmetric flaccid paralysis after consuming home-canned food. Which of the following best explains the pathophysiology?

Accepted Answer

Botulinum toxin inhibits acetylcholine release at neuromuscular junctions.

Question 10

Which of the following statements about leprosy is correct?

Accepted Answer

It is caused by Mycobacterium leprae and primarily affects the skin and peripheral nerves.

Question 11

A patient is bitten by a wild animal and develops hydrophobia, agitation, and confusion. Which of the following best describes the pathogenesis of the likely disease?

Accepted Answer

The rabies virus travels retrograde along peripheral nerves to the CNS, causing encephalitis.

Question 12

Which of the following best distinguishes classic rabies from paralytic rabies?

Accepted Answer

Classic rabies presents with hyperactivity and hydrophobia, while paralytic rabies presents with muscle weakness and paralysis.

Question 13

Which of the following is the primary method of prevention for poliomyelitis?

Accepted Answer

Vaccination with inactivated or live-attenuated poliovirus vaccine

Question 14

A patient develops fever, headache, and confusion after being bitten by a mosquito in the summer. Which of the following is the most likely diagnosis?

Accepted Answer

Arboviral encephalitis

Question 15

Which of the following viruses is most commonly associated with outbreaks of encephalitis in North America?

Accepted Answer

West Nile virus

Question 16

Which of the following is a significant concern regarding Zika virus infection during pregnancy?

Accepted Answer

It can cause microcephaly and other severe birth defects in the fetus.

Question 17

Which of the following best describes the pathogenesis of prion diseases such as Creutzfeldt-Jakob disease?

Accepted Answer

Abnormal prion proteins induce misfolding of normal proteins, leading to neurodegeneration.

Question 18

A farmer develops rapidly progressive dementia and myoclonus. Brain biopsy reveals spongiform changes. Which of the following is the most likely diagnosis?

Accepted Answer

Creutzfeldt-Jakob disease

Question 19

Which of the following is a key feature of bovine spongiform encephalopathy (BSE) transmission to humans?

Accepted Answer

Consumption of contaminated beef products can transmit prions to humans, causing variant Creutzfeldt-Jakob disease.

Question 20

A patient with HIV develops chronic headache and confusion. Cerebrospinal fluid analysis reveals encapsulated yeast. Which of the following is the most likely causative organism?

Accepted Answer

Cryptococcus neoformans

Microbial Diseases of the Nervous System: Study Guide

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