Q: Which equation best represents the calculation of opening pressure during a cerebrospinal fluid (CSF) evaluation?

$$\text{Opening Pressure} = \frac{\text{Force}}{\text{Area}} $$

Q: Which equation best describes the relationship between the fatality rate and the number of cases for a neuroinvasive disease?

$$\text{Fatality Rate} = \frac{\text{Number of Deaths}}{\text{Number of Cases}} \times 100\% $$

Q: Which equation would you use to calculate the incidence rate of a nervous system infection in a population?

$$\text{Incidence Rate} = \frac{\text{New Cases}}{\text{Population at Risk}} \times 100,000 $$

Question 1

Which of the following statements about the blood-brain barrier is correct?

Accepted Answer

It restricts passage to only very small and lipophilic molecules, making CNS infections rare and requiring special microbial virulence factors.

Question 2

A patient presents with vesicular lesions and fever. Later in life, the same patient develops painful lesions that follow a dermatome. Which pathogen is most likely responsible?

Accepted Answer

Varicella zoster virus (VZV)

Question 3

Which diagnostic test is most appropriate for confirming a case of meningococcal meningitis caused by Neisseria meningitidis?

Accepted Answer

Gram stain of cerebrospinal fluid showing Gram-negative diplococci

Question 4

Which of the following is a major virulence factor of Listeria monocytogenes that allows it to escape the phagosome?

Accepted Answer

Listeriolysin O (LLO)

Question 5

A newborn develops symptoms of meningitis five days after delivery. Which pathogen is most likely responsible, and what is the most likely route of transmission?

Accepted Answer

Listeria monocytogenes; acquired during or immediately following birth

Question 6

Which equation best represents the calculation of opening pressure during a cerebrospinal fluid (CSF) evaluation?

Accepted Answer

$$	ext{Opening Pressure} = \frac{	ext{Force}}{	ext{Area}} $$

Question 7

Which pathogen is most likely to cause flaccid paralysis by blocking acetylcholine release at neuromuscular junctions?

Accepted Answer

Clostridium botulinum

Question 8

A patient presents with muscle stiffness, lockjaw, and severe muscle spasms after a deep puncture wound. Which toxin is responsible for these symptoms?

Accepted Answer

Tetanospasmin

Question 9

Which of the following pathogens is transmitted by the tsetse fly and causes African sleeping sickness?

Accepted Answer

Trypanosoma brucei

Question 10

Which mechanism allows Trypanosoma brucei to evade the host immune system and complicates vaccine development?

Accepted Answer

Antigenic variation of variable surface glycoproteins (VSG)

Question 11

Which of the following is a major risk factor for developing neuroinvasive disease from West Nile virus infection?

Accepted Answer

Elderly age (\u003e60 years)

Question 12

A patient with AIDS develops severe encephalitis. Which protozoan is most likely responsible?

Accepted Answer

Toxoplasma gondii

Question 13

Which equation best describes the relationship between the fatality rate and the number of cases for a neuroinvasive disease?

Accepted Answer

$$	ext{Fatality Rate} = \frac{	ext{Number of Deaths}}{	ext{Number of Cases}} 	imes 100\% $$

Question 14

Which pathogen is most likely to cause meningitis following pneumonia, and is identified as alpha-hemolytic and optochin sensitive?

Accepted Answer

Streptococcus pneumoniae

Question 15

Which of the following is a recommended prevention strategy for rabies in high-risk populations?

Accepted Answer

Inactivated killed rabies vaccine

Question 16

Which equation would you use to calculate the incidence rate of a nervous system infection in a population?

Accepted Answer

$$	ext{Incidence Rate} = \frac{	ext{New Cases}}{	ext{Population at Risk}} 	imes 100,000 $$

Question 17

Which pathogen is most likely to cause irreversible tissue damage, macules, papules, and nodules, and is associated with bone and cartilage decay?

Accepted Answer

Mycobacterium leprae (lepromatous form)

Question 18

Which of the following is a key difference between tuberculoid and lepromatous forms of Hansen’s disease?

Accepted Answer

Lepromatous form is more contagious and causes irreversible tissue damage.

Question 19

Which equation best represents the calculation of the attack rate during an outbreak of nervous system infection?

Accepted Answer

$$	ext{Attack Rate} = \frac{	ext{Number of New Cases}}{	ext{Population Exposed}} 	imes 100\% $$

Infections of the Nervous System: Pathogens, Syndromes, and Clinical Management

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