Fears of contracting the H1N1 virus this flu season have people steering clear of strangers with coughs and scolding friends who don't sneeze into their crooked elbows. With everyone trying to stay germ free, hand sanitizer has become a popular means of protection. But although a quick pump from a Purell dispenser is the most convenient form of hand cleaning, is it the best? Not necessarily, according to Saint Joseph's University medical microbiology expert Michael McCann, Ph.D.