Q: Which equation best represents the calculation of case fatality rate for a bacterial meningitis outbreak?

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

Question 1

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

Accepted Answer

They protect the brain and spinal cord by providing structural support and a barrier against infection.

Question 2

A patient presents with fever, headache, and stiff neck, followed by nausea and vomiting. Which diagnostic procedure is most appropriate to confirm bacterial meningitis?

Accepted Answer

Gram stain of cerebrospinal fluid obtained via lumbar puncture

Question 3

Which bacterium is most commonly associated with meningitis in children aged 1 month to 4 years, and what is the primary prevention method?

Accepted Answer

Haemophilus influenzae; Hib vaccine

Question 4

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

Accepted Answer

It prevents most pathogens and many drugs from entering the central nervous system.

Question 5

A newborn is diagnosed with meningitis caused by Listeria monocytogenes. Which of the following is a key characteristic of this pathogen?

Accepted Answer

It reproduces in phagocytes and can cross the placenta, causing stillbirth.

Question 6

Which equation best represents the calculation of case fatality rate for a bacterial meningitis outbreak?

Accepted Answer

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

Question 7

Which of the following is a distinguishing symptom of Neisseria meningitidis infection compared to other causes of meningitis?

Accepted Answer

Rash that does not fade when pressed

Question 8

A patient with a deep puncture wound develops muscle spasms and lockjaw. Which pathogen is most likely responsible, and what is the mechanism of its neurotoxin?

Accepted Answer

Clostridium tetani; blocks relaxation pathway in muscles by inhibiting neurotransmitter release

Question 9

Which of the following is a recommended prevention strategy for botulism?

Accepted Answer

Proper canning of foods and avoiding honey for infants

Question 10

Which form of leprosy is characterized by disfiguring nodules and a negative lepromin test?

Accepted Answer

Lepromatous (progressive) form

Question 11

Which of the following statements about poliomyelitis is correct?

Accepted Answer

Improved sanitation delayed exposure, increasing paralysis rates.

Question 12

Which vaccine type for polio is associated with the risk of reversion to a virulent strain?

Accepted Answer

Attenuated live vaccine (OPV)

Question 13

A patient bitten by a wild animal is given postexposure prophylaxis for rabies. What does this treatment involve?

Accepted Answer

Rabies vaccine plus rabies immune globulin

Question 14

Which of the following is a characteristic of arboviral encephalitis caused by West Nile virus?

Accepted Answer

It is maintained in a bird-mosquito-bird cycle and can cause poliolike paralysis.

Question 15

Which protozoan disease is transmitted by the tsetse fly and can be fatal if untreated, with symptoms progressing from headache and fever to coma?

Accepted Answer

African trypanosomiasis

Question 16

Which prion disease is associated with cannibalism and presents with neurological symptoms similar to Creutzfeldt-Jakob disease?

Accepted Answer

Kuru

Question 17

Which sterilization method is recommended for surgical instruments to prevent prion diseases?

Accepted Answer

Sterilization with NaOH and extended autoclaving at 134°C

Question 18

A pregnant woman is screened for vertically transmitted infections using the TORCH panel. Which of the following is NOT included in the TORCH acronym?

Accepted Answer

Tuberculosis

Question 19

Which equation would you use to calculate the incidence rate of a disease in a population?

Accepted Answer

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

Microbial Diseases of the Nervous System: Structure, Pathogenesis, and Major Bacterial Infections

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