Weekly Influenza & Respiratory Activity: January 6-12

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January 6-12 (week 2 of 2013)

All data are preliminary and may change as more reports are received.

Influenza Activity Surveillance

  • The percentage of tests positive for influenza during week 2 as reported from the MN Lab System (MLS) Laboratory Influenza Surveillance Program:
    • Rapid influenza testing: 23.8% positive
    • PCR testing: 31.4% positive
    • Viral culture: 22 influenza A positives, 7 influenza B positives
  • The most commonly cultured strain identified so far this season at the MDH Public Health Laboratory is influenza A/H3. 
  • 476 people were hospitalized with laboratory-confirmed influenza during week 2. Since the start of the influenza season, 1,842 persons have been hospitalized with laboratory-confirmed influenza.
  • 33 deaths were identified during week 2. Since the start of the influenza season, 60 influenza-related death have been reported.
  • 46 long-term care facilities (defined as skilled nursing facilities) reported confirmed outbreaks of influenza during week 2. Since the start of the season, 107 outbreaks of influenza have been reported.
  • 92 schools reported outbreaks of influenza-like illness (ILI) during week 2. Since the start of the season, 254 outbreaks of ILI have been reported.
  • The percentage of influenza-like illness visits to outpatient clinics involved in the U.S. Outpatient Influenza-like Illness Surveillance (ILINet) was below the regional baseline at 2.05%

Circulating Respiratory Pathogen Surveillance

Of specimens tested by PCR from 3 outpatient sites for circulating viral respiratory pathogens in the previous 3 weeks for which data are available:

  • 52% were positive for influenza, of these
    • 55% were positive for influenza A/H3
    • 43% were positive for influenza B
    • 2% were postivie for influenza A (subtype undetermined)
  • 5% were positive for rhinovirus
  • 3% were positive for coronavirus OC43
  • 2% were positive for parainfluenza virus 2
  • 2% were positive for parainfluenza virus 3
  • 2% were positive for coronavirus NL63
  • 1% were positive for respiratory syncytial virus (RSV)
  • 1% were positive for adenovirus

Of specimens positive for a viral pathogen at Minnesota's 6 virology laboratories during week 2:

  • 58 were positive for respiratory syncytial virus (RSV)
  • 22 were positive for influenza A
  • 8 were positive for parainfluenza virus 3
  • 7 were positive for influenza B
  • 7 were positive for adenovirus
  • 2 were positive for cytomegalovirus (CMV)
  • 1 was positive for parainfluenza virus 2

http://www.health.state.mn.us/divs/idepc/diseases/flu/stats/index.html

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