Wow, people can get funding to study just about anything. Though in all fairness, it had to be tested for it could be said outside of someone's opinion. The thing is... if you are healthy and have a healthy immune system, wash your hands a few times a day, and generally aren't into playing with strange piles of shit they see laying around, a handshake or a high five is not dangerous. That means that it's not dangerous for the average person to shake hands, which is a reasonable and respectful greeting that I'm not willing to let get thrown away because people are being raised to be afraid of "germs".