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WHO PANDEMIC ALERT PHASES Print E-mail
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พฤหัสบดี, 30 เมษายน 2009

 

 

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Phase 1: No infections in humans are being caused by viruses circulating in animals.

 

 

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Phase 2: Animal flu virus causes infection in humans, and is a potential pandemic threat.

 

 

 

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Phase 3: Flu causes sporadic cases in people, but no significant human-to-human transmission.

 

 

 

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Phase 4: Human-to-human transmission and community-level outbreaks.

 

 

 

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Phase 5: Human-to-human transmission in at least two countries. Strong signal pandemic imminent.

 

 

 

 

 

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Phase 6: Virus spreads to another country in a different region. Global pandemic under way

 

 

 

 

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Post-peak: Pandemic activity appears to be decreasing though second wave possible.
Post-pandemic: activity returns to normal, seasonal flu levels

 

 

รูปจาก BBC News  WHO raises pandemic alert level

Last Updated ( พฤหัสบดี, 30 เมษายน 2009 )
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