1999–2000 Influenza Season Summary

Details

• Corporate Authors:
  National Center for Infectious Diseases (U.S.)
• Description:
  Synopsis: During the 1999-2000 season, influenza type A(H3N2) was the predominant strain circulating in the United States. Influenza activity (virus isolation, morbidity and mortality) peaked between mid-December and mid-January. The percentage of respiratory specimens testing positive for influenza viruses peaked at 33% during mid to late December. During the previous 3 influenza seasons (1996-97, 1997-98, and 1998-99), the peak percentages of respiratory specimens testing positive for influenza viruses ranged from 28% to 34%. The percentage of overall patient visits for influenza-like illness (ILI) during the 1999-2000 season peaked at 6% in late December and the proportion of deaths attributed to pneumonia and influenza (P&I) peaked at 11.2% in mid-January. During the previous 3 influenza seasons, the peak percentages of patient visits for ILI ranged between 5% and 7% and peak P&I mortality levels ranged between 8.8% and 9.1%. This season's P&I figures must be interpreted with caution because important changes have taken place in the case definition that may be contributing to higher estimates of P&I mortality than in previous years.
• Subjects:
  Disease Outbreaks Influenza, Human/epidemiology Public Health Surveillance
• Series:
  FluView
• Document Type:
  Text
• Genre:
  Newsletter ; Statistics
• Place as Subject:
  United States
• Volume:
  1999
• Collection(s):
  Stephen B. Thacker CDC Library
• Main Document Checksum:
  urn:sha-512:244515a4d4c675f723100cdab380270f4c5fd02151dd5e1ed8187d9dd75d42d0f94a6d4c4c29392614fdd86b8d7726e23362cb733dd562cae0a50abb02e19074
• Download URL:
  https://stacks.cdc.gov/view/cdc/147772/cdc_147772_DS1.pdf
• File Type:
  [PDF - 242.60 KB ]