Current researches on large number of air and water borne disease causing pathogens such as Ebola, Anthrax, Chickenpox, Influenza, Smallpox, Tuberculosis, Taeniasis, E. coli, Cholera, Hookworm, etc. wash your hands or use hand sanitizer before handling food and after shaking hands.
always wash with soap and water if your hands are visibly soiled.
try to minimize touching your mouth or nose with your hands.
avoid sick people, if possible.