Handshake vs. Fist Bump: Which is safer?

Dr. Richard Besser went to the lab to find out which greeting spread more E. coli.
3:00 | 01/13/14

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Transcript for Handshake vs. Fist Bump: Which is safer?
This is world news beyond the headlines. I'm here in this food safety lab doing a test of E. -- and handshaking and fist pumping. Take a look at this and -- put my hand 20000. But we're gonna use it to simulate what happens when we shake hands when we fist bump and when we do high fives to try and figure out this flu season what's the safest way to go. Take a look at this. I shook hands with all the volunteers in group one. Then they -- their hands into special plates which were incubating it overnight look at the amount of bacteria from -- -- and the one on the left. -- here's how much it passed on to the first volunteer in line she had almost as many as me now let's compare that to a fist bump. Again I'm on the left the played on the right the first fist bump drastically fewer germs than -- passed on in the handshake. Fist -- minimize the surface area and protect the fingers and palms from germs. But did you know that time also matters. Systems also reduce the length of time your hands are in contact and when we tried -- high five mine is on the left the first type five on the right. The results. Just about the same as the fist bump. So this winter this cold and flu season what's it going to be a handshake a fist bump or high five. -- fist bumping. For ABC news in Yahoo! News I'm -- rich -- in College Park, Maryland you can follow me at doctor Richard --

This transcript has been automatically generated and may not be 100% accurate.

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