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Influenza Summary Update (for the week ending May 20, 2000--Week 20)

Public Domain
File Language:
English


Details

  • Corporate Authors:
    National Center for Infectious Diseases (U.S.)
  • Description:
    THIS IS THE FINAL REPORT OF THE 1999-2000 SEASON. WEEKLY REPORTS WILL RESUME IN OCTOBER 2000.

    Synopsis: During week 20 (May 14 through May 20), none of the specimens tested for influenza virus by WHO and NREVSS laboratories were positive. State and territorial epidemiologists from 6 states reported sporadic influenza activity; none reported widespread or regional activity. The proportion of patient visits to sentinel physicians for influenza-like illness was within baseline levels of 0% to 3% in the United States overall and in all 9 surveillance regions. The proportion of deaths attributed to pneumonia and influenza was 6.6%. This percentage is below the epidemic threshold for week 20.

    During the current season, the overall national percentage of respiratory specimens positive for influenza peaked at 33% during week 51. During the previous 3 seasons (1996-97, 1997-98, and 1998-99), the peak percentages of respiratory specimens testing positive for influenza viruses ranged from 28% to 34%. For this season, the percentage of overall patient visits for influenza-like illness peaked at 6% during week 52. During the previous 3 years, the peak percentages for such visits ranged between 5% and 7%. The proportion of deaths attributed to pneumonia and influenza (P&I) peaked at 11.2% during week 3. During the previous 3 years, P&I mortality levels peaked between 8.8% and 9.1%. This season's P&I figures must be interpreted with caution because important changes have taken place in this year's case definition that may be contributing to higher estimates of P&I mortality than in previous years

  • Subjects:
  • Series:
    FluView
  • Document Type:
    Text
  • Genre:
  • Place as Subject:
    United States
  • Volume:
    1999
  • Issue:
    20
  • Collection(s):
  • Main Document Checksum:
    urn:sha-512:cb64d55f11bc88bdcedac70b798f071e72b4081f351d50068ffc9c7f9f64d347127eeff050187c969143654d1048eb0071f4c86b4a947db6986db7783ff0fe1a
  • Download URL:
  • File Type:
    Filetype[PDF - 169.40 KB ]
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