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    • A baby in Gaza has a strain of polio linked to mistakes in eradication campaign, experts say

    Displaced infant Abdel-Rahman Abuel-Jedian, who suffers from polio, sleeps at a makeshift tent camp in Deir al-Balah, central Gaza Strip, Tuesday, Aug. 27, 2024. (AP Photo/Abdel Kareem Hana) Displaced infant Abdel-Rahman Abuel-Jedian, who suffers from polio, sleeps at a makeshift tent camp in Deir al-Balah, central Gaza Strip, Tuesday, Aug. 27, 2024. (AP Photo/Abdel Kareem Hana)
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    LONDON -

    The baby in Gaza who was recently paralyzed by polio was infected with a mutated strain of the virus that vaccinated people shed in their waste, according to scientists who say the case is the result of β€œan unqualified failure” of public health policy.

    The infection, which marked the first detection of polio in the war-torn Palestinian territory in more than 25 years, paralyzed the lower part of one leg in the unvaccinated 10-month-old child. The baby boy was one of hundreds of thousands of children who missed vaccinations because of the fighting between Israel and Hamas.

    Scientists who have been monitoring polio outbreaks said the baby's illness showed the failures of a global effort by the World Health Organization and its partners to fix serious problems in their otherwise largely successful eradication campaign, which has nearly wiped out the highly infectious disease. Separately, a draft report by experts deemed the WHO effort a failure and β€œa severe setback.”

    The polio strain in question evolved from a weakened virus that was originally part of an oral vaccine credited with preventing millions of children worldwide from being paralyzed. But that virus was removed from the vaccine in 2016 in hopes of preventing vaccine-derived outbreaks.

    Public health authorities knew that decision would leave people unprotected against that particular strain, but they thought they had a plan to ward off and quickly contain any outbreaks. Instead, the move resulted in a surge of thousands of cases.

    β€œIt was a really horrible strategy,” said Columbia University virologist Vincent Racaniello, who was not involved with the report or the WHO. β€œThe decision to switch vaccines was based on an incorrect assumption, and the result is now we have more polio and more paralyzed children.”

    A draft copy of the report commissioned by the WHO and independent experts said the plan underestimated the amount of the strain in the environment and overestimated how well officials would be able to squash outbreaks.

    The plan led to vaccine-linked polio outbreaks in 43 countries that paralyzed more than 3,300 children, the report concluded.

    Even before the Gaza case was detected, officials reviewing the initiative to tinker with the vaccine concluded that β€œthe worst-case scenario has materialized,” the report said.

    The report has not yet been published, and some changes will likely be made before the final version is released next month, the WHO said.

    The strain that infected the baby in Gaza had lingered in the environment and mutated into a version capable of starting outbreaks. It was traced to polio viruses spreading last year in Egypt, according to genetic sequencing, the WHO said.

    In 2022, vaccine-linked polio viruses were found to be spreading in Britain, Israel and the U.S., where an unvaccinated man was paralyzed in upstate New York.

    Scientists now worry that the emergence of polio in a war zone with an under-immunized population could fuel further spread.

    Racaniello said the failure to track polio carefully and to sufficiently protect children against the strain removed from the vaccine has had devastating consequences.

    β€œOnly about 1% of polio cases are symptomatic, so 99% of infections are silently spreading the disease,” he said.

    The oral polio vaccine, which contains a weakened live virus, was withdrawn in the U.S. in 2000. Doctors continued to vaccinate children and eventually moved to an injected vaccine, which uses a dead virus and does not come with the risk that polio will be present in human waste. Such waste-borne virus could mutate into a form that triggers outbreaks in unvaccinated people.

    The report's authors faulted leaders at the WHO and its partners, saying they were unable or unwilling β€œto recognize the seriousness of the evolving problem and take corrective action.”

    WHO spokesman Oliver Rosenbauer acknowledged that the vaccine strategy β€œexacerbated” the risk of epidemics linked to the vaccine.

    He said in an email that immunization β€œwas not implemented in such a way to rapidly stop outbreaks or to prevent new strains from emerging.” Rosenbauer said not hitting vaccination targets was the biggest risk for allowing vaccine-linked viruses to emerge.

    β€œYou need to reach the children with the vaccines … regardless of which vaccines are used,” he said.

    The WHO estimates that 95% of the population needs to be immunized against polio to stop outbreaks. The U.N. health agency said only about 90 per cent of Gaza’s population was vaccinated earlier this year.

    To try to stop polio in Gaza and the wider region, the WHO and its partners plan two rounds of vaccination campaigns later this week and next month, aiming to cover 640,000 children. Authorities will use a newer version of the oral polio vaccine that targets the problematic strain. The weakened live virus in the new vaccine is less likely to cause vaccine-derived outbreaks, but they are still possible.

    The WHO said Thursday that it had reached an agreement with Israel for limited pauses in fighting in Gaza to allow for the vaccinations. The agency's representative in the Palestinian territories said the first three-day pause would start Sunday in central Gaza. That will be followed by another three-day pause in southern Gaza and then another in northern Gaza. The pauses were to last eight or nine hours each day.

    Racaniello said it was β€œunethical” that the WHO and its partners were using a vaccine that is unlicensed in rich countries precisely because it can increase the risk of polio in unvaccinated children.

    The oral polio vaccine, which has reduced infections globally by more than 99%, is easy to make and distribute. Children require just two drops per dose that can be administered by volunteers. The oral vaccine is better at stopping transmission than the injected version, and it is cheaper and easier to administer.

    But as the number of polio cases caused by the wild virus have plummeted in recent years, health officials have been struggling to contain the increasing spread of vaccine-linked cases, which now comprise the majority of polio infections in more than a dozen countries, in addition to Afghanistan and Pakistan, where transmission of the wild virus has never been stopped.

    β€œThis is the result of the Faustian bargain we made when we decided to use" the oral polio vaccine, said Dr. Paul Offit, director of the Vaccine Education Center at the University of Philadelphia. β€œIf we really want to eradicate polio, then we need to stop using the vaccine with live (weakened) virus.”

    ___

    The Associated Press Health and Science Department receives support from the Howard Hughes Medical Institute’s Science and Educational Media Group. The AP is solely responsible for all content.

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