we compared risk factors , clinical presentation , and progression of patients
The median age of patients with H7N9 virus infection was older than other patient groups
To provide insights into the pathogenesis of H7N9 virus infection , we compared risk factors , clinical presentation , and progression of patients hospitalized with H7N9 , H5N1 , and 2009 pandemic H1N1 ( pH1N1 ) virus infections .
The median age of patients with H7N9 virus infection was older than other patient groups ( 63 years ; P < .001 ) and a higher proportion was male ( 71 % ; P < .02 ) .