NPR.org, April 29, 2009
The World Health Organization (WHO) increased its pandemic flu alert level Wednesday to Phase 5 — its second-highest level and a further indication that WHO scientists are seeing human-to-human spread of the virus in at least two countries.
The announcement was made at a WHO news conference Wednesday in Geneva. There are numerous cases of human-to-human transmission in both Mexico and the United States. However, the WHO has until now hesitated to make the leap to Phase 5 because the cases of transmission in the United States are within tight-knit groups.
http://www.npr.org/templates/story/story.php?storyId=103593687
Note: The WHO description of Phase 5 is “a situation in which the likelihood of a pandemic is very high or inevitable.”
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