Michigan Update on H1N1 Influenza and Vaccine


Michigan Department of Community Health

  • Eden V. Wells, MD, MPH
  • Internal Use Only
  • For Official Use Only
  • Sensitive But Unclassified
  • October 14, 2009


All 45 local health departments:

–Health Officer with legal authorities
–Medical Director
–Emergency Preparedness Coordinator
–Immunization Staff
–Communicable Disease Staff
–Coordination of plans

  • Emergency Management
  • Businesses
  • Community/organizations
  • Schools
  • Healthcare

2009 Novel Influenza A (H1N1)

  • April 2009, Mexico and SE California
  • Rapid spread through Mexico and US
  • May 2009, intercontinental spread
  • WHO Pandemic Phase 6-June 2009

International Epidemiology Update

2009 H1N1 Influenza

As of October 2, 2009:
–World Health Organization (WHO) regions have reported over 343,298 laboratory-confirmed cases
–At least 4,108 deaths
–The laboratory-confirmed cases represent a substantial underestimation of total cases

International Epidemiology Update

  • From April 19 to September 19, 2009, 59.8% of influenza were 2009 H1N1 viruses
  • 2009 H1N1 is still circulating widely

–Southern Hemisphere -trends are downward or baseline in temperate regions
–Tropical Asia -variable rates
–Tropical regions of Central America –increased activity
–Northern temperate zones –increased activity


Michigan-October 13, 2009

  • Since September 1, 2009:

–55 hospitalizations
–5 deaths

  • 8,000-11,000 cases influenza-like illness cases/wk over last 2 weeks

Pneumococcal Polysaccharide Vaccine (PPSV23) and Influenza

  • Influenza predisposes persons to bacterial community-acquired pneumonia
  • Ensure high risk patients have received PPSV23 vaccine

–Any person age 65 years or older
–Any person 2-64 years with a high-risk condition

  • New recommended groups for vaccination are:

–Persons 19 years of age or older who have asthma or who smoke cigarettes

  • No more than 2 lifetimedoses are recommended, spaced at least 5 years apart
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