Q: Which equation best represents the probability $$P of $$infection via indirect transmission, given the contact rate $$C$$, probability of contamination $$p_c$$, and probability of infection per contact $$p_i$$?

$$P = C \times p_c \times p_i$$

Question 1

Which of the following is an example of indirect transmission of infection?

Accepted Answer

Touching a doorknob contaminated with a virus and then touching your face.

Question 2

A person contracts Lyme disease after being bitten by a tick. What mode of transmission does this represent?

Accepted Answer

Indirect transmission via vector-borne route.

Question 3

Which of the following best describes droplet transmission?

Accepted Answer

Transmission through large respiratory droplets expelled during coughing or sneezing.

Question 4

A child contracts chickenpox after playing with a toy that was previously handled by an infected child. What is the most likely mode of transmission?

Accepted Answer

Indirect transmission via fomite.

Question 5

Which of the following scenarios is NOT an example of indirect transmission?

Accepted Answer

Catching a cold after shaking hands with an infected person.

Question 6

Which equation best represents the probability $$P of $$infection via indirect transmission, given the contact rate $$C$$, probability of contamination $$p_c$$, and probability of infection per contact $$p_i$$?

Accepted Answer

$$P = C 	imes p_c 	imes p_i$$

Question 7

A person develops rabies after being bitten by a stray dog. Which type of transmission is this, and what is the best prevention strategy?

Accepted Answer

Direct transmission; ensure pets are vaccinated.

Question 8

Which of the following is a key difference between direct and indirect transmission?

Accepted Answer

Indirect transmission requires an intermediate object or organism.

Question 9

A person contracts an infection after inhaling airborne particles from a sneeze. What is the mode of transmission?

Accepted Answer

Indirect transmission via airborne route.

Question 10

Which of the following best describes a fomite?

Accepted Answer

An inanimate object that can carry infectious agents.

Question 11

If a disease is transmitted from animals to humans, what is this process called?

Accepted Answer

Zoonotic transmission.

Question 12

Which of the following is the most effective way to prevent indirect transmission via fomites?

Accepted Answer

Regularly disinfecting commonly touched surfaces.

Question 13

A person develops food poisoning after eating contaminated food. What is the mode of transmission?

Accepted Answer

Indirect transmission via vehicle-borne route.

Question 14

Which of the following is NOT a characteristic of vector-borne transmission?

Accepted Answer

It involves an inanimate object.

Question 15

A person contracts COVID-19 after being in close proximity to an infected individual who is coughing. What is the most likely mode of transmission?

Accepted Answer

Direct transmission via droplet spread.

Modes of Transmission of Infectious Diseases

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