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MMWR Morb Mortal Wkly Rep. 1993 May 28;42(20):385-7.

Update: influenza activity--United States, 1992-93 season.

Abstract

Influenza activity in the United States increased from December 1992 through mid-February 1993; during this period, influenza type B viruses circulated at high levels nationwide. However, since late February, high levels of influenza type A have been reported. This report updates surveillance for influenza during the 1992-93 season.

PMID:
8492794
[Indexed for MEDLINE]
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