Revised WHO pandemic scale requires higher incidence of disease for most alert levels

Collier, Roger
June 2009
CMAJ: Canadian Medical Association Journal;6/9/2009, Vol. 180 Issue 12, pE95
Academic Journal
The article focuses on the revision made by the World Health Organization on its 6-point scale pandemic alert system on A (H1N1) outbreak. It focuses on the addition of level Phase 4 from its Phase 3 alert system. It argues that Phase 4 of the Pandemic alert system should be raised where there is a sustained human-to-human transmission of the virus. However, the new alert system does not mean that a pandemic is occurring in a certain locality. It also states that the revision includes the declaration of the Phase 5 alert system where a virus spread into at least 2 countries in a certain geographical region.


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