Question 1

Which of the following best describes the function of the blood-brain barrier?

Accepted Answer

It is a highly selective permeable barrier that protects the brain from toxins, pathogens, and harmful substances in the blood.

Question 2

A 22-year-old college student living in a dormitory develops sudden fever, headache, and stiff neck. Which bacterial pathogen is most likely responsible for this outbreak?

Accepted Answer

Neisseria meningitidis

Question 3

Which of the following is a common pathogenicity factor shared by both Neisseria meningitidis and Streptococcus pneumoniae?

Accepted Answer

Polysaccharide capsule

Question 4

Why does Listeria monocytogenes pose a significant threat to the food industry?

Accepted Answer

It can survive and grow in cold, damp environments, leading to contamination and recalls.

Question 5

A newborn develops meningitis after the mother consumed unpasteurized cheese during pregnancy. Which pathogen is most likely responsible?

Accepted Answer

Listeria monocytogenes

Question 6

Which of the following statements about Clostridium tetani is correct?

Accepted Answer

It is a gram-positive, endospore-forming obligate anaerobe.

Question 7

The term 'lockjaw' is associated with tetanus because:

Accepted Answer

The toxin blocks inhibitory neurotransmitters, causing muscle spasms and jaw rigidity.

Question 8

Which of the following best explains why honey should not be given to infants under one year old?

Accepted Answer

Honey may contain Clostridium botulinum spores, which can germinate and produce toxin in the immature digestive tract.

Question 9

Which of the following statements about Mycobacterium leprae is TRUE?

Accepted Answer

It requires living host cells and is often cultured using animal models such as the mouse footpad.

Question 10

A patient presents with disfiguring nodules and mucous membrane involvement. Which form of leprosy is most likely?

Accepted Answer

Lepromatous (progressive) leprosy

Question 11

Which of the following equations best represents the generation time ($$G) of $$Mycobacterium leprae if it doubles every 12 days?

Accepted Answer

$$G = 12\ 	ext{days}$$

Question 12

Which of the following best explains why improved sanitation led to more severe polio cases in adolescents?

Accepted Answer

Infants were not exposed early and lacked maternal antibodies when infected later, leading to more severe disease.

Question 13

Which of the following is a disadvantage of the Sabin (oral polio) vaccine compared to the Salk (inactivated polio) vaccine?

Accepted Answer

There is a rare risk of vaccine-associated paralytic polio due to reversion to virulence.

Question 14

A patient is bitten by a bat and develops symptoms of restlessness and excitability. Which type of rabies is most likely present?

Accepted Answer

Furious (classical) rabies

Question 15

Which of the following pathogens is NOT capable of crossing the placenta to infect the fetus?

Accepted Answer

Clostridium tetani

Question 16

Which of the following is the most effective strategy for controlling arbovirus transmission in a community?

Accepted Answer

Vector control, personal protection, and vaccination

Question 17

A pregnant woman is screened using the TORCH panel. Which of the following infections is NOT included in the standard TORCH screen?

Accepted Answer

Clostridium botulinum

Question 18

Which of the following best describes prions?

Accepted Answer

Self-replicating infectious proteins

Question 19

A patient in Africa develops fever, headache, and neurological changes after being bitten by a tsetse fly. Which causative agent is most likely responsible?

Accepted Answer

Trypanosoma brucei gambiense

Question 20

Which of the following statements best explains the difference between Trypanosoma brucei gambiense and T. b. rhodesiense infections?

Accepted Answer

T. b. rhodesiense causes a rapid, acute infection with early CNS involvement and is more severe.

Microbial Infections of the Nervous System: Chapter 22 Study Guide

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