United States An initial shortfall of swine flu vaccine is predicted shortly after the proportion of deaths attributed to pneumonia and influenza goes above the epidemic threshold[448] in some states,[449] with flu activity widespread in 41 states.[450] It is also announced that the number cases, hospitalizations and deaths are unprecedented for this time of year, with flu-like illnesses accounting for 6.1% of all doctor visits, itself an unusually high number.[451]