"From that point of view, it's a lot easier to isolate cases and stop the transmission," Hartl said.
Tweet Chat on Vaccines
At 1 p.m., ET today, ABC News' chief health and medical editor, Dr. Richard Besser, will moderate a tweet chat to explain which vaccinations adults should get, at what age and why. Guest tweeters include the Centers for Disease Control and Prevention, the American Medical Association, the Mayo Clinic and the Sabin Institute. Major hospitals and research centers from all over the country will also be tweeting need-to-know information.
Vaccines may be your best protection from disease and illness. Don't miss this important discussion on how to find out how the right vaccines can help you stay healthy. You don't have to be a Twitter expert to participate. Just click here and follow these three easy steps.