The H1N1 flu is back and it's striking mostly young adults. More than 90 percent of flu cases statewide have been identified as the H1N1 strain, commonly referred to as "Swine Flu" since it reemerged in 2009 after lying dormant since the 1960s and 1970s.
Marc Itskowitz, an internal medicine physician at Allegheny General Hospital has the answer for why the swine flu is hitting young people so hard.
“Many of the young adults and children have not been exposed to this virus and therefore do not have built up, innate immunity to this virus. And so without the vaccine this is the most vulnerable population to get sick when they’re exposed to this infection.”