Polio Resurfaces in Laos

An article from Scientific American
October 13, 2015
GENEVA/LONDON (Reuters) - Laos has suffered a case of vaccine-derived polio, the World Health Organization said on Monday, in a new setback to a global plan to eradicate the crippling disease after the virus resurfaced in Ukraine and Mali.
 
The WHO said an 8-year-old boy died of the disease on Sept. 11, and genetic sequencing suggested the virus strain has been circulating in the area of Bolikhamxay province, which has low immunization rates, for more than two years.
 
A global vaccination campaign has all but beaten the wild polio virus, with only Pakistan and Afghanistan reporting cases of wild polio virus infection this year.
 
Specialists have warned that vaccine-derived cases - such as this one in Laos and previous ones in Ukraine and Mali - could hamper progress towards global eradication.
 
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