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H1N1 Influenza Liz Ritchie, M.S. Risk Communication Analyst Office of Public Health Preparedness A couple housekeeping things… Welcome! My presentation = 20 minutes. Your questions = 10 minutes. A little about me. This might be our first meeting, but shouldn’t be the last.

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h1n1 influenza

H1N1 Influenza

Liz Ritchie, M.S.

Risk Communication Analyst

Office of Public Health Preparedness

a couple housekeeping things
A couple housekeeping things…
  • Welcome!
  • My presentation = 20 minutes.
  • Your questions = 10 minutes.
  • A little about me.
  • This might be our first meeting, but shouldn’t be the last.
what i will cover
What I will cover…
  • Some history.
  • Some very basic biology.
  • A little terminology.
  • Reflections on recent experience.
  • What now?
some history
Last Four Pandemics

1918: Influenza A (H1N1), severe, killed 20 million

1957: Influenza A (H2N2), moderate, killed 70,000

1968: Influenza A (H3N2), moderate, killed 34,000

2009: Influenza A (H1N1), mild, killed ?

Strong potential for animal infection spreading to humans (zoonosis).

Some History
some very basic biology
Some Very Basic Biology
  • Virus
    • ~1/100th size of bacteria
    • examples: influenza, smallpox, Ebola, HIV, polio
    • covered by protein coat
    • some have fat envelope
    • host cell required for reproduction
    • not all cause disease
    • high mutation rate
    • antibiotics are ineffective
    • can treat with antivirals or vaccines (if available)
a little terminology
A little terminology…
  • Immunity: a protective element, often gained by previous exposure.
  • Novel: something we’ve never seen before.
    • no vaccine available
    • may or may not have effective antivirals
    • no natural immunity
  • Transmissibility: how easy something spreads from one thing to another.
  • Virulence: how likely something is to cause disease.
recent experience
2009 Influenza A (H1N1) – pandemic strain

99% of Influenza-Like Illness (ILI) = this strain

Michigan schools closed = 73

Michigan ILI (October 25-31) = 59,629

Michigan H1N1-related Deaths = ~17

48 U.S. states reporting “widespread activity”

Global: over 441,661 cases with 5712 deaths… < 1%

Avian Influenza A (H5N1)

widely circulating since 2003

15 countries

442 cases with 262 deaths… 59%

Centers for Disease Control and Prevention

http://www.cdc.gov/h1n1flu/

World Health Organization

http://www.who.int/

Recent Experience
prevention
Prevention
  • Vaccination is the best way to prevent influenza infection and its complications.
    • Vaccine is slowly being produced… about 10 million doses each week.
    • Expect the H1N1 vaccine to be as safe as seasonal flu vaccines.
    • Children require two shots for full immune response.
    • Current target groups: pregnant women, people 6-24, anyone who has regular contact with children < 6 months old, emergency and healthcare personnel, and anyone with underlying health conditions.
  • Everyday actions can help prevent transmission.
    • Wash your hands regularly with soap and water.
    • Don’t cough/sneeze on people (or in your hands).
    • Stay home if you’re sick.
treatment
Treatment
  • Antivirals (Tamiflu®, Relenza®)
    • patients who are severely ill (such as those who are hospitalized)
    • patients who are ill with influenza-like illness and have a higher risk for influenza related complications
  • In vast majority of cases, healthy individuals recover from H1N1 influenza.
    • lots of fluids
    • rest
    • antipyretics to reduce fever/discomfort
    • cough syrup
what now
What Now?
  • Get your seasonal and H1N1 vaccines.
  • Regularly check the CDC’s and Michigan’s influenza websites.
    • www.cdc.gov/h1n1flu
    • www.michigan.gov/flu
  • 911 Coordinators should be in contact with their respective LHD/hospital emergency preparedness coordinator(s), health officer(s), and medical director(s).
  • Regularly check the local health department website(s) for your area.
thank you
Thank You!

Liz Ritchie

Risk Communication Analyst

Office of Public Health Preparedness

(517) 335-8839

ritchiee1@michigan.gov