What is Influenza? • A single stranded RNA virus • Spikes (surface proteins) protruding from surface • Hemaglutinin • Neuraminidase
• Flu viruses are named by their Surface proteins hemagglutinin and neuraminidase
H5N1
Annual Flu • Two flu seasons a year • Northern Hemisphere • Southern Hemisphere
• Worldwide:
GET VACCINATED!
~5 million flu cases/year ~500,000 deaths/year
Pandemic Flu • ~3 times per century • Antigenic shift • Population naive (unexposed)
• The Spanish Flu of 1918
Factors affecting dental caries in rural Alaska Native children, 2008
Questions Are Alaskans being exposed to H5N1? Have rural subsistence hunters been exposed to this deadly virus?
Is exposure common or uncommon? Are people who are handling wild birds taking precautions when having contact with wild birds?
What did we learn about exposures? • Lots of exposure to birds potentially infected with H5N1 • All 3 groups: >10 years of cumulative exposure to wild birds
What did we learn about risk factors? • > 50% of hunters didn’t wash their hands during or after hunting
• No
Were any of the groups exposed to H5N1?
• Despite high levels of exposure, and lack of hand washing, none of the study participants had antibody to H5N1
Main Messages from the H5N1 Study • There were no exposures to H5N1 virus • Persons need to wash their hands, during, and after hunting and after cleaning wild birds
• Wild birds should be cooked thoroughly before consuming
Haemophilus influenzae A (Hia) • Gram-negative bacteria • Can live in your throat • Can cause severe clinical illness • Meningitis, epiglotitis, pneumonia, cellulitis, bacteremia, septic arthritis
• Spread by coughing, sneezing, touching contaminated surfaces
Haemophilus influenzae A (Hia) • Devastating illness in young children • Most are <2 years of age
• 25% of cases died or suffered very serious long-term damage (hearing loss, loss of extremities etc.) • 1 in 10 cases died • Alaska and Northern Canada have the highest rates of invasive Hia in the world
H. pylori
Arctic Zombie Summary • Zombie-like organisms from the past can get us by melting out of the permafrost – Anthrax • Zombie-like organisms can get us from the air (coughed or sneezed) – Influenza, Hia • Zombie-like organisms can be spread from person to person and survive the acid of the stomach to live comfortably within us for the rest of our lives– Helicobacter pylori • Zombie-like organisms can be spread to us from contact with animals (birds) – H5N1 and many other organisms
“It is the microbes that will have the last word.” Louis Pasteur
“It is the microbes that will have the last word.” Louis Pasteur
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