Update: influenza activity--United States, 1992-93 season.
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.
D004196:Disease Outbreaks; D006801:Humans; D009980:Influenza A virus / Q000302:isolation & purification*; D009981:Influenza B virus / Q000302:isolation & purification*; D007251:Influenza, Human / Q000453:epidemiology* / Q000382:microbiology; D012621:Seasons; D014481:United States / Q000453:epidemiology