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American health officials declared a public health emergency as cases of swine flu were confirmed in the U.S. Health officials across the world fear this could be the leading edge of a global pandemic emerging from Mexico, where seven people are confirmed dead as a result of the new virus.
On Wednesday April 29th, the World Health Organization (WHO) raised its pandemic alert level to five on its six-level threat scale,1 which means they've determined that the virus is capable of human-to-human transmission. The initial outbreaks across North America reveal an infection already traveling at higher velocity than did the last official pandemic strain, the 1968 Hong Kong flu.
Phase 5 had never been declared since the warning system was introduced in 2005 in response to the avian influenza crisis. Phase 6 means a pandemic is under way. WHO now openly states it is not possible to contain the spread of this infection and recommends mitigation measures, not restricting travel or closing borders.
However, a pandemic does not necessarily mean what you think it does, it is NOT black-plague carts being hauled through the streets piled high with dead bodies. Nor does it mean flesh eating zombies wandering the streets feeding on the living. All a pandemic means is that a new infectious disease is spreading throughout the world.
The number of fatalities, and suspected and confirmed cases across the world change depending on the source, so your best bet -- if you want the latest numbers -- is to use Google Maps' Swine Flu Tracker.
Several nations have imposed travel bans, or made plans to quarantine air travelers2 that present symptoms of the swine flu, such as:
Fever of more than 100
Coughing
Runny nose and/or sore throat
Joint aches
Severe headache
Vomiting and/or diarrhea
Lethargy
Lack of appetite
Top global flu experts are trying to predict how dangerous the new swine flu strain will be, as it became clear that they had little information about Mexico's outbreak. It is as yet unclear how many cases occurred in the month or so before the outbreak was detected. It's also unknown whether the virus was mutating to be more lethal, or less.