Q: Which equation describes the fatality rate $$F$$ for St. Louis encephalitis, given the number of deaths $$D$$ and the total number of cases $$C$$?

$$F = \frac{D}{C} \times 100\%$$

Question 1

A patient presents with sudden onset of fever, headache, stiff neck, and confusion. Laboratory tests reveal a Gram-negative, aerobic diplococcus in the cerebrospinal fluid. Which organism is most likely responsible for this case of meningitis?

Accepted Answer

Neisseria meningitidis

Question 2

Which of the following best explains why bacterial meningitis is generally more severe than viral meningitis?

Accepted Answer

Bacterial toxins cause more extensive damage to nervous tissue.

Question 3

A newborn is diagnosed with neonatal gonorrheal ophthalmia. Which preventative measure is most effective in reducing the risk of this condition?

Accepted Answer

Treating the newborn's eyes with antibiotics immediately after birth

Question 4

A patient develops muscle rigidity and convulsive spasms after a minor wound. Spores from which organism are most likely responsible, and what is the primary prevention method?

Accepted Answer

Clostridium tetani; vaccination with tetanus toxoid

Question 5

Which equation best represents the probability $$P of a $$person developing foodborne botulism after consuming contaminated food, given the incidence rate $$I$$ and the population exposed $$N$$?

Accepted Answer

$$P = \frac{I}{N}$$

Question 6

Which of the following statements about leprosy (Hansen’s Disease) is correct?

Accepted Answer

Leprosy primarily affects the skin, peripheral nerves, and mucous membranes.

Question 7

A child presents with redness, itchiness, and discharge from the eye. The physician prescribes antibiotic drops. Which condition is most likely being treated?

Accepted Answer

Conjunctivitis (pink eye)

Question 8

Which of the following is a major risk factor for severe poliomyelitis infection?

Accepted Answer

Malnutrition

Question 9

A patient is bitten by a raccoon and develops symptoms including fatigue, muscle aches, and agitation. Which disease is most likely, and what is the recommended post-exposure intervention?

Accepted Answer

Rabies; postexposure vaccination

Question 10

Which equation describes the fatality rate $$F$$ for St. Louis encephalitis, given the number of deaths $$D$$ and the total number of cases $$C$$?

Accepted Answer

$$F = \frac{D}{C} 	imes 100\%$$

Question 11

Which of the following best differentiates African trypanosomiasis from American trypanosomiasis?

Accepted Answer

African trypanosomiasis is caused by Trypanosoma brucei and leads to coma, while American trypanosomiasis is caused by Trypanosoma cruzi and may produce granulomas in the CNS.

Question 12

Which of the following is a characteristic feature of prion diseases?

Accepted Answer

They are caused by abnormally folded proteins that become infectious particles.

Question 13

A patient with immunocompromised status develops inflammation of white matter and demyelination in the CNS. Which viral infection is most likely responsible?

Accepted Answer

Polyomavirus JC causing Progressive Multifocal Leukoencephalopathy (PML)

Question 14

Which of the following is a typical route of transmission for Cryptococcus neoformans leading to cryptococcal meningitis?

Accepted Answer

Inhalation of soil contaminated with bird droppings

Question 15

A child develops otitis media following a viral upper respiratory infection. Which of the following best explains the pathophysiology?

Accepted Answer

Secondary bacterial infection complicates the viral infection, leading to excessive exudate and pressure against the ossicles and tympanic membrane.

Question 16

Which equation would you use to calculate the percentage of asymptomatic carriers $$A in a $$population $$P if$$ $$C is $$the number of carriers?

Accepted Answer

$$A = \frac{C}{P} 	imes 100\%$$

Question 17

Which of the following is true regarding the treatment of viral meningitis?

Accepted Answer

There is no specific treatment; the immune system typically produces antibodies to destroy the virus.

Question 18

A patient presents with symptoms of fever, personality change, tremors, and seizures after consuming contaminated food. Which organism is most likely responsible for this CNS infection?

Accepted Answer

Listeria monocytogenes

Question 19

Which of the following prion diseases is associated with a defective gene encoding the prion protein and multicentric amyloid plaques in the frontal lobe?

Accepted Answer

Gerstmann-Sträussler-Scheinker syndrome (GSSS)

Infections of the Nervous System and Sensory Structures

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