Good point as you don't know where that hand has been ...good suggestion on carrying hand sanitizer solution with you....we could all just blow a kiss in the air for that matter...could be a whole new social sign of acceptance and agreement between 2 parties..BD
Scientists from the London School of Hygiene say a quick "air kiss" on the cheek is a relatively-germ free affair when compared to a hand-shake.
They say regardless how clean your hands may be there is no guarantee that the other person maintains the same standards of personal hygiene and hands are critical in the chain of infection. Infections from surfaces to people and between people are carried on the hands and with some of the quite nasty bugs currently circulating a quick rinse under cold water is just not enough to combat them.
Many people acquire infections after touching someone else's hands and they might have been better served by a quick peck on the cheek. Experts recommend that people carry an alcohol-based hand sanitizer for when it is not possible to access a sink; otherwise washing the hands rigorously with soap and water is enough to keep the hands relatively bug free.
In the study of hand hygiene the researchers led by Professor Sally Bloomfield, say though shaking hands is the main form of physical contact you have no knowledge of what the other person has been touching before you greet them.