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1999-2000 INFLUENZA SEASON SUMMARY
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2000
[PDF-242.60 KB]
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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.
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