$$Prevalence = \frac{\text{Total number of cases}}{\text{Total population}}$$

Question 1

Which of the following best describes an 'adhesion factor' in the context of microbial pathogenesis?

Accepted Answer

A substance that enables microbes to attach to host tissues

Question 2

A patient is diagnosed with leukopenia. Which of the following best explains this condition?

Accepted Answer

A decrease in the number of white blood cells

Question 3

Which of the following is an example of a non-communicable disease?

Accepted Answer

Tetanus

Question 4

A hospital outbreak is traced to contaminated intravenous fluids. What is the most likely mode of transmission?

Accepted Answer

Vehicle transmission

Question 5

Which of the following best defines 'incidence' in epidemiology?

Accepted Answer

The number of new cases of a disease occurring in a population during a specific period

Question 6

A person who harbors a pathogen but does not show symptoms and can transmit the disease is called a:

Accepted Answer

Carrier

Question 7

Which of the following is a virulence factor that can cause fever and shock when released from Gram-negative bacteria?

Accepted Answer

Endotoxin

Question 8

A disease that is constantly present in a population is referred to as:

Accepted Answer

Endemic

Question 9

Which of the following best describes zoonosis?

Accepted Answer

A disease that is transmitted from animals to humans

Question 10

Which stage of disease is characterized by the appearance of general symptoms but not yet specific to the disease?

Accepted Answer

Prodromal period

Question 11

A patient develops symptoms after being bitten by a mosquito carrying malaria. What type of transmission is this?

Accepted Answer

Vector transmission, biological

Question 12

Which of the following is NOT a typical sign of inflammation?

Accepted Answer

Leukopenia

Question 13

Which formula correctly calculates the prevalence of a disease in a population?

Accepted Answer

$$Prevalence = \frac{	ext{Total number of cases}}{	ext{Total population}}$$

Question 14

Which of the following is a function of hemolysin produced by some bacteria?

Accepted Answer

Destroys red blood cells

Question 15

A disease that appears suddenly and affects many individuals in a community is classified as:

Accepted Answer

Epidemic

Question 16

Which of the following best describes the role of a 'reservoir' in infectious disease?

Accepted Answer

A source where the pathogen normally lives and multiplies

Question 17

Which of the following is a mechanical vector?

Accepted Answer

A fly carrying pathogens on its legs

Question 18

Which of the following is most likely to be a sign rather than a symptom?

Accepted Answer

Fever

Question 19

A patient is infected with a microbe but does not show any symptoms. What is the best term to describe this infection?

Accepted Answer

Subclinical infection

Question 20

Which of the following is the correct sequence of the stages of disease?

Accepted Answer

Incubation period → Prodromal period → Period of illness → Period of decline → Convalescence

Epidemiology and Disease Transmission: Key Terms and Resources

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