Pneumonia due to pandemic (H1N1) 2009 influenza virus and Klebsiella pneumoniae capsular serotype K16 in a patient with nasopharyngeal cancer.

Streptococcus pneumoniae, Haemophilus influenzae, Staphylococcus aureus and group A Streptoccocus, but no Klebsiella pneumoniae were responsible for bacterial coinfections during the 2009 and previous influenza pandemics. We hereby report a case with concurrent bacteremic pneumonia due to an unusual capsular serotype K16 K. pneumoniae and pandemic (H1N1) 2009 influenza in a patient with nasopharyngeal cancer. Such a coinfection has not previously been described.