Which mode of disease transmission includes indirect contact via surfaces or objects (fomites)?

Which mode of disease transmission includes indirect contact via surfaces or objects (fomites)?

• A. Airborne
• B. Droplet
• C. Contact (including indirect contact via fomites)
• D. Vector-borne

Answer: (C)

This question targets how diseases spread through contact with inanimate objects. Indirect contact via surfaces or objects is a form of contact transmission, specifically through fomites. Fomites are things like doorknobs, shared utensils, towels, or phones that can become contaminated with pathogens. If a person touches a contaminated surface and then touches their eyes, nose, or mouth—or touches something else that leads to the entry point—the pathogen can cause infection. This differs from direct contact transmission, which requires physical touch between people, such as a handshake. It also differs from airborne transmission, where pathogens travel through tiny particles that can linger in the air and move long distances, and from droplet transmission, where larger respiratory droplets travel only a short distance before depositing on mucous membranes. Vector-borne transmission involves a living carrier, like a mosquito or tick, moving the pathogen from one host to another.

This question targets how diseases spread through contact with inanimate objects. Indirect contact via surfaces or objects is a form of contact transmission, specifically through fomites. Fomites are things like doorknobs, shared utensils, towels, or phones that can become contaminated with pathogens. If a person touches a contaminated surface and then touches their eyes, nose, or mouth—or touches something else that leads to the entry point—the pathogen can cause infection.

This differs from direct contact transmission, which requires physical touch between people, such as a handshake. It also differs from airborne transmission, where pathogens travel through tiny particles that can linger in the air and move long distances, and from droplet transmission, where larger respiratory droplets travel only a short distance before depositing on mucous membranes. Vector-borne transmission involves a living carrier, like a mosquito or tick, moving the pathogen from one host to another.