Q: A patient presents with fever, headache, stiff neck, and photophobia. A lumbar puncture reveals high white blood cell count, high protein, and low glucose in the CSF. Which equation would best describe the glucose difference between blood and CSF in bacterial meningitis?

$$\text{CSF glucose} \u003c \text{Blood glucose}$$

Q: Which equation best represents the effect of botulinum toxin on neurotransmitter release?

$$\text{Acetylcholine released} = 0$$

Q: A patient with a deep puncture wound develops intense muscle spasms and cannot relax their muscles. Which equation best describes the effect of tetanospasmin toxin?

$$\text{Inhibitory neurotransmitter released} = 0$$

Question 1

Which of the following best describes the function of the blood–brain barrier in the nervous system?

Accepted Answer

It selectively allows very small and lipophilic molecules to pass while blocking most hydrophilic and large molecules.

Question 2

A patient presents with fever, headache, stiff neck, and photophobia. A lumbar puncture reveals high white blood cell count, high protein, and low glucose in the CSF. Which equation would best describe the glucose difference between blood and CSF in bacterial meningitis?

Accepted Answer

$$	ext{CSF glucose} \u003c 	ext{Blood glucose}$$

Question 3

Which of the following pathogens is most likely to cause meningitis in neonates within the first 28 days of life?

Accepted Answer

Group B Streptococcus

Question 4

Which mechanism allows Listeria monocytogenes to evade antibody-mediated immune responses?

Accepted Answer

It grows and divides inside the cytoplasm after escaping the phagosome.

Question 5

A patient bitten by a bat develops hydrophobia, confusion, and pharyngeal spasms. Which diagnostic method is most likely to confirm rabies postmortem?

Accepted Answer

Detection of Negri bodies in brain tissue

Question 6

Which equation best represents the effect of botulinum toxin on neurotransmitter release?

Accepted Answer

$$	ext{Acetylcholine released} = 0$$

Question 7

Which of the following is a key difference between viral and bacterial meningitis?

Accepted Answer

Bacterial meningitis is more likely to cause long-term disabilities and has a higher mortality rate.

Question 8

Which of the following best explains why the nervous system contains no normal microbiota?

Accepted Answer

Resident microbes would disrupt crucial functions and are considered abnormal.

Question 9

A patient with a deep puncture wound develops intense muscle spasms and cannot relax their muscles. Which equation best describes the effect of tetanospasmin toxin?

Accepted Answer

$$	ext{Inhibitory neurotransmitter released} = 0$$

Question 10

Which of the following is a major risk factor for developing cryptococcal meningitis?

Accepted Answer

Immunocompromised status, such as HIV/AIDS

Question 11

Which of the following best describes the pathogenesis of African sleeping sickness?

Accepted Answer

Trypanosoma brucei crosses the blood–brain barrier and induces a strong immune response that can harm host neurons.

Question 12

Which of the following is a recommended prevention strategy for toxoplasmosis in pregnant women?

Accepted Answer

Avoiding contact with cat litter and undercooked meat

Question 13

Which of the following best explains the fatal cascade caused by prions in transmissible spongiform encephalopathy?

Accepted Answer

PrPC proteins are converted to PrPSC, which then convert more PrPC, leading to neuron death.

Question 14

Which of the following is a distinguishing feature of Neisseria meningitidis compared to other bacterial causes of meningitis?

Accepted Answer

It produces a capsule and can cause a petechial rash that progresses to bruise-like lesions.

Question 15

Which of the following best describes the effect of the gut-brain axis on nervous system function?

Accepted Answer

Resident microbes in the digestive system can influence neurotransmitter production and brain function.

Question 16

Which of the following is a primary virulence factor of Streptococcus pneumoniae in causing meningitis?

Accepted Answer

Production of pneumolysin toxin that lyses phagocytic cells and stimulates inflammation.

Question 17

Which of the following best explains why the oral polio vaccine (OPV) is not recommended for immunocompromised individuals?

Accepted Answer

OPV contains live, attenuated virus that can revert to a virulent form.

Question 18

Which of the following best describes the mechanism of disease in primary amoebic meningoencephalitis (PAM)?

Accepted Answer

Naegleria fowleri trophozoites burrow into the nasal mucosa and travel up the olfactory nerves into the brain.

Nervous System Infections: Microbiology and Clinical Principles

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