How many of the hospitalized patients had underlying medical conditions?
A large proportion (73%) of patients hospitalized with 2009 H1N1 had one or more underlying conditions, including asthma, diabetes, heart, lung, or neurologic disease, or pregnancy. Asthma was the most common underlying medical condition, and was found in 29% of children and 27% of adults. Although underlying medical conditions were common, severe illness among young healthy persons was also identified.
