Question 1

Which of the following is NOT considered a natural defense of the central nervous system (CNS)?

Accepted Answer

Normal biota

Question 2

A patient presents with fever, headache, stiff neck, and photophobia. CSF analysis reveals gram-negative diplococci. Which organism is most likely responsible?

Accepted Answer

Neisseria meningitidis

Question 3

Which layer of the meninges is closest to the brain tissue?

Accepted Answer

Pia mater

Question 4

Why are drugs and antibiotics often difficult to introduce into the CNS?

Accepted Answer

The blood-brain barrier restricts passage of most molecules

Question 5

Which of the following statements about the normal biota of the nervous system is correct?

Accepted Answer

Detection of any microbes in the CNS usually indicates disease

Question 6

A newborn develops meningitis after passing through the birth canal. Which organism is most likely responsible?

Accepted Answer

Streptococcus agalactiae

Question 7

Which of the following is a distinguishing feature of Streptococcus pneumoniae meningitis compared to Neisseria meningitidis?

Accepted Answer

Most frequent cause of community-acquired meningitis

Question 8

A patient with a history of immunosuppression develops chronic meningitis with a gradual onset. CSF analysis reveals a spherical organism with a large capsule. What is the most likely causative agent?

Accepted Answer

Cryptococcus neoformans

Question 9

Which of the following organisms is associated with 'Valley Fever' and forms spherules in tissue?

Accepted Answer

Coccidioides immitis

Question 10

Which of the following is TRUE regarding viral meningitis?

Accepted Answer

90% of cases are caused by enteroviruses

Question 11

A patient presents with symptoms of meningitis, but CSF analysis is negative for bacteria, fungi, and protozoa. What is the most likely diagnosis?

Accepted Answer

Aseptic (viral) meningitis

Question 12

Which of the following organisms can cross the placenta and cause fetal death or premature abortion?

Accepted Answer

Listeria monocytogenes

Question 13

Which of the following is a major virulence factor for Neisseria meningitidis?

Accepted Answer

Polysaccharide capsule

Question 14

Which equation best represents the probability of a mother transmitting Toxoplasma gondii to her fetus during pregnancy?

Accepted Answer

$$P_{transmission} = 0.33$$

Question 15

Which of the following is the most common cause of bacterial meningitis in adults and children?

Accepted Answer

Streptococcus pneumoniae

Question 16

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

Accepted Answer

It restricts passage of most microorganisms and drugs

Question 17

Which organism is most likely to cause meningitis in a patient who consumed contaminated dairy products?

Accepted Answer

Listeria monocytogenes

Question 18

Which of the following is a distinguishing feature of Haemophilus influenzae meningitis?

Accepted Answer

It is associated with serotype B (Hib)

Question 19

Which of the following is a function of cerebrospinal fluid (CSF)?

Accepted Answer

Provides a liquid cushion for the brain and spinal cord

Question 20

Which of the following statements about the gut-brain axis is correct?

Accepted Answer

Gut microbiota can induce CNS autoimmunity

Infectious Diseases Manifesting in the Nervous System: Microbiology Study Notes

Study Guide - Practice Questions

Study Guide - Flashcards