LONDON – Polio, the dreaded paralyzing disease stamped out in the industrialized world, is spreading in Nigeria. And health officials say in some cases, it’s caused by the vaccine used to fight it. In July, the World Health Organization issued a warning that this vaccine-spread virus might extend beyond Africa. So far, 124 Nigerian children have been paralyzed this year — about twice those afflicted in 2008. The polio problem is just the latest challenge to global health authorities trying to convince wary citizens that vaccines can save them from dreaded disease. For years, myths have abounded about vaccines — that they were the Western world’s plan to sterilize Africans or give them AIDS. The sad polio reality fuels misguided fears and underscores the challenges authorities face using a flawed vaccine. Nigeria and most other poor nations use an oral polio vaccine because it’s cheaper, easier, and protects entire communities.
So when WHO officials discovered a polio outbreak in Nigeria was sparked by the polio vaccine itself, they assumed it would be easier to stop than a natural “wild” virus.
They were wrong.
In 2007, health experts reported that amid Nigeria’s ongoing outbreak of wild polio viruses, 69 children had also been paralyzed in a new outbreak caused by the mutation of a vaccine’s virus.
Back then, WHO said the vaccine-linked outbreak would be swiftly overcome — yet two years later, cases continue to mount. They have since identified polio cases linked to the vaccine dating back as far as 2005.
It is a worrying development for officials who hope to end polio epidemics in India and Africa by the end of this year, after missing several earlier deadlines. “It’s very disturbing,” said Dr. Bruce Aylward, who heads the polio department at the World Health Organization.
This year, the number of polio cases caused by the vaccine has doubled: 124 children have so far been paralyzed, compared to 62 in 2008, out of about 42 million children vaccinated. For every case of paralysis, there are hundreds of other children who don’t develop symptoms, but pass on the disease.
Experts have long believed epidemics unleashed by a vaccine’s mutated virus wouldn’t last since the vaccine only contains a weakened virus strain — but that assumption is coming under pressure. Some experts now say that once viruses from vaccines start circulating they can become just as dangerous as wild viruses.
“The only difference is that this virus was originally in a vaccine vial,” said Olen Kew, a virologist at the.
The oral polio vaccine used in Nigeria and elsewhere contains a mild version of the live virus. Children who have been vaccinated pass the virus into the water supply through urine or feces. Other children who then play in or drink that water pick up the vaccine’s virus, which gives them some protection against polio.
But in rare instances, as the virus passes through unimmunized children, it can mutate into a strain dangerous enough to ignite new outbreaks, particularly if immunization rates in the rest of the population are low.
Kew said genetic analysis proves mutated viruses from the vaccine have caused at least seven separate outbreaks in Nigeria.
Aside from Nigeria, polio persists in a handful of other countries, including Afghanistan, Pakistan, India, Chad, Angola and Sudan.
Afghanistan, Pakistan, India, Chad, Angola and Sudan ,sounds suspiciously like a wish list of US invasion…. but maybe I’m just paranoid.
Vaccinations for killer diseases are a good idea BUT must be done properly and NOT ON THE CHEAP!!! This can cause more damage than help.
Vaccinations for FLU is a very BAD IDEA!
SWINE FLU = PIGS HAVE FLOWN