Which transmission type can travel through air and cover large spaces?

• A. Direct contact
• B. Vehicle
• C. Airborne transmission
• D. Parenteral

Answer: (C)

The concept being tested is how some infections spread through the air over distances. Airborne transmission happens when the pathogen is carried by tiny aerosol particles or droplets that can stay suspended in the air for a long time. Because these particles can travel beyond close contact, people can inhale them even if they are not near the infected person, allowing spread across a room or larger spaces, especially in enclosed or poorly ventilated areas. This is why measures like proper ventilation, air filtration, and masks can help prevent spread.

In contrast, direct contact transmission requires physical touch with an infected person or their bodily fluids; vehicle transmission involves contaminated objects or substances spreading the infection; and parenteral transmission requires the pathogen to enter the body through the skin, such as via needles.