Vaccine-derived polio virus (VDPV) is extremely rare, and detected in children with immunodeficiency or in populations with low levels of immunization, the health ministry said in a statement. - See more at: http://www.ummid.com/news/2013/June/24.06.2013/ministry_on_polio_death.html#sthash.usg5YrAK.dpuf
Vaccine-derived polio virus (VDPV) is extremely rare, and detected in children with immunodeficiency or in populations with low levels of immunization, the health ministry said in a statement.
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