Touch. Washing hands is good basic hygiene. But is only of limited help for airborne diseases.
Infection control is *really* important in healthcare and care homes. We should be testing, and isolating when +ve, all patients, residents and staff. Especially when moving between environments.
Air Hygiene should be built into corporate health & safety rules and building codes.
Isolation when ill and especially +ve Covid needs support from the state. With statutory sick pay.