[quote]usmccds423 wrote:
A sad warning to the anti-vaccine crowd.
[/quote]
From the article:
"But even vaccination itself can sometimes lead to an outbreak.
One type of vaccine, oral polio vaccine (OPV), contains a weakened form of the polio virus. For a six to eight weeks after vaccination, the virus is excreted but is incapable of infecting people in its attenuated state. However, in extremely rare cases, the virus can be shed for longer periods and sometimes mutate into an infective form â?? vaccine-derived poliovirus (VDPV)."
[quote]usmccds423 wrote:
A sad warning to the anti-vaccine crowd.
[/quote]
From the article:
"But even vaccination itself can sometimes lead to an outbreak.
One type of vaccine, oral polio vaccine (OPV), contains a weakened form of the polio virus. For a six to eight weeks after vaccination, the virus is excreted but is incapable of infecting people in its attenuated state. However, in extremely rare cases, the virus can be shed for longer periods and sometimes mutate into an infective form â?? vaccine-derived poliovirus (VDPV)."[/quote]