Methods for current statistical analysis of excess pneumonia-influenza deaths.

THE USE of excess mortality as an index for recognition of influenza outbreaks is well known through the detailed studies of the late Dr. Selwyn Collins. In his historical reviews, the sequence of influenza outbreaks in the United States was traced back to the late 19th century, and in analytical studies age differen¬ tials and other factors were investigated. A bibliography of Collins' many papers in this field was recently published (1). Collins' primary, if not sole, interest in ex¬

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[7]  A. Langmuir,et al.  [Asian influenza surveillance]. , 1958, Public health reports.