The immune response to influenza virus isn't 'all good'

Complications following infection with the virus that causes flu (influenza virus) are one of the top ten causes of death in the United States. Although infection with influenza virus can directly cause death, many deaths following infection with influenza virus occur because the individual develops pneumonia due to secondary infection with bacteria such as Streptococcus pneumoniae. How influenza makes individuals more sensitive to pneumonia-causing secondary bacterial infections is not well understood. However, Jane Deng and colleagues, at the University of California, Los Angeles, have now determined, through studies in mice, one mechanism by which influenza might sensitize individuals to secondary bacterial pneumonia.

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