What is the major method of transmission of infectious disease when using public transportation?touching surfaces that sick people have touchedbreathing air that sick people have exhaledbreathing air after sick people have coughed and sneezedbeing coughed on and sneezed on by sick people

The major methods of transmission of infectious diseases when using public transportation include:

1. Touching surfaces that sick people have touched: This is a common way diseases spread in public transportation. When a sick person touches a surface, they can leave behind germs. If another person touches the same surface and then touches their face, they can get infected.

2. Breathing air that sick people have exhaled: When a sick person breathes, coughs, or sneezes, they release droplets into the air. These droplets can contain germs. If another person breathes in these droplets, they can get infected.

3. Breathing air after sick people have coughed and sneezed: This is similar to the previous point. The droplets released by a sick person can stay in the air for a while. If another person breathes in this air, they can get infected.

4. Being coughed on and sneezed on by sick people: This is a direct way of getting infected. The droplets released by a sick person can land on another person. If these droplets land on the other person's face, they can get infected.

In summary, all these methods are major ways of transmission of infectious diseases in public transportation. It's important to maintain good hygiene practices like washing hands regularly, wearing masks, and keeping distance from sick people to prevent getting infected.