How was a pathogen transmitted when an infected individual coughs in a subway car, and another develops symptoms two days later?

• A. Vector-borne transmission
• B. Direct contact transmission
• C. Airborne transmission
• D. Vehicle transmission

Answer: (C)

The scenario describes a situation where an individual coughs, releasing respiratory droplets into the air within a contained space, such as a subway car. These droplets can carry pathogens that may be inhaled by nearby individuals. This method of transmission is classified as airborne transmission, which involves the spread of infectious agents through the air.

In this case, the airborne particles can remain suspended in the air or settle on surfaces, but primarily it’s the inhalation of these droplets by another person that leads to the development of symptoms two days later, indicating an infection. Airborne transmission is particularly significant in environments with close proximity and limited ventilation, making public transportation systems like subway cars prime examples for this mode of transmission.

Understanding this mechanism is crucial in preventing the spread of infectious diseases in crowded spaces, where individuals may not have direct contact with one another but can still become infected through airborne particles.