Colds and flu are spread by sneezing and this is excellent advice. Sometimes we forget that the other side of the story is host resistance– meaning not everyone exposed to infections gets the disease. It is pretty clear from studies that things like having enough vitamin D can reduce your risk of getting sick. Stress, even the “good stress” of over-exercise, can reduce your immune protection. Still it’s best to do what we can to avoid passing germs around unnecessarily. Hand washing is important although the use of antibacterial hand soaps is probably NOT a good idea since they seem to promote antibacterial resistance and may be implicated in thyroid dysfunction. Soap and water are still best. We use essential oil or colloidal silver sprays to disinfect surfaces.
Sneezing and coughing into your arm has become the standard suggestion of not just the C.D.C., but also organizations like the American Academy of Pediatrics and the American Public Health Association. Even the New York City subway system occasionally runs an announcement asking riders to “cough or sneeze into the bend of your arm or use a tissue.” New York Times. FEB. 27, 2018