 A Wisconsin study published in the Journal of the American Medical Association in September 2010 , reported that findings showed that the 2009 H1N1 flu was no more severe than the seasonal flu . " The risk of most serious complications was not elevated in adults or children " , the study 's authors wrote . " Children were disproportionately affected by 2009 H1N1 infection , but the perceived severity of symptoms and risk of serious outcomes were not increased . " Children infected in the 2009 H1N1 flu pandemic were no more likely to be hospitalized with complications or get pneumonia than those who catch seasonal strains . About 1 @.@ 5 % of children with the H1N1 swine flu strain were hospitalized within 30 days , compared with 3 @.@ 7 % of those sick with a seasonal strain of H1N1 and 3 @.@ 1 % with an H3N2 virus . 
