Question 1

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

Accepted Answer

Bacterial pathogens release toxins that cause shock and inflammation, leading to rapid and severe damage.

Question 2

A patient presents with fever, headache, stiff neck, and a rapidly progressing rash. Gram-negative diplococci are found in the cerebrospinal fluid. Which pathogen is most likely responsible?

Accepted Answer

Neisseria meningitidis

Question 3

Which of the following is a key virulence factor that allows Haemophilus influenzae to cause meningitis?

Accepted Answer

Capsule formation

Question 4

Why are children under 4 years old, especially around 6 months, particularly susceptible to Haemophilus influenzae meningitis?

Accepted Answer

They lack sufficient antibodies due to waning maternal immunity and incomplete vaccination.

Question 5

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

Accepted Answer

It blocks the relaxation pathway in muscles, causing sustained muscle contraction.

Question 6

A 2-month-old infant develops flaccid paralysis after consuming honey. Which is the most likely diagnosis and causative agent?

Accepted Answer

Infant botulism caused by Clostridium botulinum

Question 7

Which of the following statements about Listeria monocytogenes is TRUE?

Accepted Answer

It is a psychrophile that can grow at refrigeration temperatures and is often foodborne.

Question 8

A patient with a history of eating unpasteurized cheese develops meningitis. The Gram stain shows Gram-positive rods. Which organism is most likely responsible?

Accepted Answer

Listeria monocytogenes

Question 9

Which of the following best explains why prion diseases are so difficult to eliminate from surgical instruments?

Accepted Answer

Prions are resistant to heat, chemicals, and radiation, requiring extended autoclaving at 134°C and NaOH treatment.

Question 10

Which of the following is the correct sequence of events in rabies virus infection after a bite from a rabid animal?

Accepted Answer

Virus replicates in muscle near bite, moves up peripheral nerves to CNS, then spreads to salivary glands.

Question 11

Which of the following vaccines is associated with rare cases of vaccine-derived poliomyelitis in the United States?

Accepted Answer

Sabin vaccine (OPV)

Question 12

A patient presents with loss of sensation in skin areas and a positive lepromin test. Which form of leprosy is most likely?

Accepted Answer

Tuberculoid (neural) leprosy

Question 13

Which of the following best describes the function of the blood-brain barrier in the context of microbial diseases?

Accepted Answer

It restricts the entry of most pathogens into the CNS, but some have virulence factors to bypass it.

Question 14

Which of the following is a common diagnostic method for bacterial meningitis?

Accepted Answer

Gram stain or latex agglutination of cerebrospinal fluid

Question 15

A patient with a history of a deep puncture wound develops muscle spasms and lockjaw. Which treatment is most appropriate?

Accepted Answer

Administration of tetanus immune globulin

Question 16

Which of the following statements about prion diseases is CORRECT?

Accepted Answer

They are caused by infectious proteins that induce abnormal folding of normal proteins.

Question 17

Which of the following best explains why Listeria monocytogenes is particularly dangerous for pregnant women?

Accepted Answer

It can cross the placenta, causing spontaneous abortion or stillbirth.

Question 18

Which of the following is the most common initial symptom of poliomyelitis?

Accepted Answer

Sore throat and nausea

Question 19

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

Accepted Answer

The CNS includes the brain and spinal cord, while the PNS includes all other nerves.

Microbial Diseases of the Nervous System: Structure, Pathogenesis, and Clinical Features

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