What are vehicle modes of transmission?

• A. Air, water, or food
• B. Direct contact with an infected person
• C. Water, blood, or food
• D. Mosquitoes and ticks

Answer: (C)

Vehicle transmission occurs when an inanimate object or substance carries an infectious agent from one person to another. Water, blood, and food are classic examples because pathogens can hitch a ride on these substances and reach a new host when they are ingested, consumed, or otherwise come into contact with the body. For instance, contaminated water can spread cholera, contaminated food can spread foodborne illnesses, and contaminated blood products can transmit infections.

In contrast, direct contact with an infected person is a form of contact transmission, not a vehicle. Mosquitoes and ticks are vectors—living organisms that carry pathogens from one host to another. Air is a medium for airborne transmission, not a vehicle. So the description that best fits vehicle transmission is water, blood, or food.