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Polio Surge In Nigeria After
Vaccine Virus Mutates

By MARIA CHENG, AP Medical Writer
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.
But it is made from a live polio virus - albeit weakened - which carries a small risk of causing polio for every million or so doses given. In even rarer instances, the virus in the vaccine can mutate into a deadlier version that ignites new outbreaks.
The vaccine used in the United States and other Western nations is given in shots, which use a killed virus that cannot cause polio.
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.
When Nigerian leaders suspended polio vaccination in 2003, believing the vaccine would sterilize their children and infect them with HIV, Nigeria exported polio to nearly two dozen countries worldwide, making it as far away as Indonesia.
Nigeria resumed vaccinations in 2004 after tests showed the vaccine was not contaminated with estrogen, anti-fertility agents or HIV.
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 U.S. Centers for Disease Control and Prevention.
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.
Though Nigeria's coverage rates have improved, up to 15 percent of children in the north still haven't been vaccinated against polio. To eradicate the disease, officials need to reach about 95 percent of the population.
Nigeria's vaccine-linked outbreak underlines the need to stop using the oral polio vaccine as soon as possible, since it can create the very epidemics it was designed to stop, experts say. WHO is researching other vaccines that might work better, but none is on the horizon.
Until a better vaccine is ready, WHO and U.S. CDC officials say the oral vaccine is the best available tool to eradicate polio and that when inoculation rates are nearly 100 percent it works fine.
"Nigeria is almost a case study in what happens when you don't follow the recommendations," Kew said.
Since WHO and partners began their attempt to rid the world of polio in 1988, officials have slashed the disease's incidence by more than 99 percent.
But numerous deadlines have been missed and the number of cases has been at a virtual standstill since 2000. Critics have also wondered whether it is time to give up, and donors may be sick of continuing to fund a program with no clear endgame.
"Eradication is a gamble," said Scott Barrett, an economist at Columbia University who has studied polio policies. "It's all or nothing ... and there is a very real risk this whole thing may fall apart."
Aside from Nigeria, polio persists in a handful of other countries, including Afghanistan, Pakistan, India, Chad, Angola and Sudan.
Aylward agreed the Nigeria situation was another unwelcome hurdle, but was confident eradication was possible. "We still have a shot," he said. "We're throwing everything at it including the kitchen sink."
Patricia Doyle, PhD
Hello Jeff: Here we go again, polio virus outbreak as a result of polio vaccine. Polio could be cut down or wiped out, not by vaccine, but by removal of sewage from water and environment. Period! Polio lives harmlessly in our guts and is not problematic until it gets into drinking water, soil etc as a result of poor sanitation.   
So why waste the money on mass vaccination campaigns and put that money into sanitation?
Oh, then the Polio virus won't be infecting people in the third world and everyone will figure out that Polio vaccine campaigns are shams. We didn't need Polio vaccine in the US or first world because in the early 1950s we were beginning to remove sewage from drinking water and swimming areas.
I worry that one of these mutated Polio viruses will mutate so much that it might someday evade vaccine of those vaccinated many decades ago and cause a major global pandemic of Polio. If only, the WHO had simply concentrated on sanitation and not vaccine.
Proper hand-washing also combats Polio outbreaks. People who do not wash their hands after using the bathroom serve to spread Polio further.
To recap, good sanitation and hygiene are more important to combating Polio than vaccine.
Patricia A. Doyle DVM, PhD Bus Admin, Tropical Agricultural Economics Univ of West Indies Please visit my "Emerging Diseases" message board at: http://www.emergingdisease.org/phpbb/index.php Also my new website: http://drpdoyle.tripod.com/ Zhan le Devlesa tai sastimasa Go with God and in Good Health 
Gayle Eversole - The Leaflady
In Canada in the 50s, 60s when polio was a big issue, MDs were curing it with iodine. This surely is a very inexpensive way to address the current issue if one could get this information to the right places.  Here is more... http://naturalhealthnews.blogspot.com/2009/08/polio-
Gayle Eversole, DHom, PhD, MH, NP, ND
Founder and Director, Creating Health Institute and The Oake Centre for natural health education
Creator of ADVENTURX, the original xtreme sports supplement
visit us at Natural Health News, Natural Notes and BlogTalkRadio/herbalYODA-Says
we're on twitter, GreenMuze, LinkedIn, and Facebook too.

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