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Reply to Chughtai et al.

TO THE EDITOR—We thank Dr Chughtai et al for providing feedback on our article entitled “Does Influenza Vaccination Modify Influenza Severity? Data on Older Adults Hospitalized With Influenza During the 2012–2013 Season in the United States.” They point out three main issues with our analysis: (1) exclusion of hospitalized cases who were not treated with antivirals, (2) exclusion of hospitalized cases who were institutionalized in long-term care facilities, and (3) death in the intensive care unit (ICU) as a nonindependent competing risk. We have carefully reviewed their comments and suggestions, reanalyzed the data, and prepared our responses. We will address the three issues separately: