There are so many things we cannot control in times of health crisis (coworkers that come to work with a headache and a fever, people that sneeze or cough in public, etc.)
Instead of stressing over these things, it's best to focus our attention on the things we can do and control (i.e. in the case of the new virus, handwashing has been recognized as a first-line defense in disease prevention).

Increased awareness of your hands throughout the day can help you avoid touching your mouth, eyes, and nose.