How do you protect yourself form infectious disease?

There are a few ways to do this-

Avoid contact with people who have disease.

Wash hands/ keep clean and sanitary- this is obvious.

Medication (of course)

Diet and nutritional food can help you stay well.

Public bathrooms and restaurants can carry diseases just from others being in them.
So line the toilet with paper before use and make sure silverware and cups have been washed before use.

Etc there are many other ways this is just a list

The return of the wolf to yellowstone national park will probably affect the bird population to some degree, not significantly. while wolves will hunt birds when necessary, they prefer to hunt larger prey. the bird population will most likely only be affected when hunting is scarce for the wolves. birds of prey will also probably not be affected as much as other birds who spend more time on the ground hunting for food as the tend to spend more time in the air or in trees since they do not need to stay on the ground for long due to the nature of the way they hunt.

Ther are many reasons.. is it a multiple choice?