Q: Which of the following equations best represents the risk of severe neurological symptoms and fatality from West Nile virus as age increases?

$$\text{Risk} = \text{Base risk} \times e$$^{\text{Age factor}$$}$$

Question 1

Which of the following best describes the function of the meninges in the human nervous system?

Accepted Answer

They produce cerebrospinal fluid and protect the brain and spinal cord.

Question 2

A patient presents with fever, headache, stiff neck, and a rash that does not fade when pressed. Which pathogen is most likely responsible for these symptoms?

Accepted Answer

Neisseria meningitidis

Question 3

Which of the following is a major reason why Listeria monocytogenes is able to cause disease in refrigerated foods?

Accepted Answer

It is able to grow at refrigerator temperatures.

Question 4

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

Accepted Answer

It restricts passage of many substances from the blood to the CNS.

Question 5

A lumbar puncture is performed to diagnose meningitis. Which of the following is the most critical reason for immediate processing of the cerebrospinal fluid (CSF) sample?

Accepted Answer

Pathogens in CSF do not survive storage or changes in temperature.

Question 6

Which of the following pathogens is most commonly associated with foodborne transmission and can cause meningitis in newborns?

Accepted Answer

Listeria monocytogenes

Question 7

Which neurotoxin blocks the release of acetylcholine, resulting in flaccid paralysis?

Accepted Answer

Botulinal toxin

Question 8

A child develops muscle spasms after stepping on a rusty nail. Which organism is most likely responsible, and what is the mechanism of disease?

Accepted Answer

Clostridium tetani; release of tetanospasmin that blocks muscle relaxation

Question 9

Which of the following is a distinguishing feature of lepromatous (progressive) leprosy compared to tuberculoid (neural) leprosy?

Accepted Answer

Disfiguring nodules over the body and involvement of mucous membranes

Question 10

Which of the following equations best represents the risk of severe neurological symptoms and fatality from West Nile virus as age increases?

Accepted Answer

$$	ext{Risk} = 	ext{Base risk} 	imes e$$^{	ext{Age factor}$$}$$

Question 11

Which of the following is the primary vector for transmission of African trypanosomiasis?

Accepted Answer

Tsetse fly

Question 12

Which of the following pathogens is associated with the formation of Negri bodies in the brain stem?

Accepted Answer

Rabies virus

Question 13

A patient is diagnosed with primary amebic meningoencephalitis after swimming in a warm freshwater lake. Which organism is most likely responsible?

Accepted Answer

Naegleria fowleri

Question 14

Which of the following is a characteristic of prion diseases such as Creutzfeldt-Jakob disease?

Accepted Answer

They are caused by self-replicating infectious proteins.

Question 15

Which of the following is the most effective method for sterilizing surgical instruments to prevent transmission of prion diseases?

Accepted Answer

Sterilization with NaOH and extended autoclaving at 134°C

Question 16

Which of the following pathogens is most likely to cause meningitis in immunocompromised individuals after inhalation of dried bird droppings?

Accepted Answer

Cryptococcus neoformans

Question 17

Which of the following is a key reason why Trypanosoma brucei is difficult to target with vaccines?

Accepted Answer

It evades antibodies through antigenic variation.

Question 18

Which of the following is a major risk factor for vertical transmission of Listeria monocytogenes from mother to fetus?

Accepted Answer

Consumption of deli meats and unpasteurized dairy products during pregnancy

Question 19

Which of the following tests is commonly used to diagnose arboviral encephalitis by detecting IgM antibodies?

Accepted Answer

ELISA

Microbial Diseases of the Nervous System: Structure, Pathogenesis, and Key Pathogens

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