Zimbabwe launches emergency polio vaccination campaign after 3 cases detected

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• Zimbabwe began an emergency campaign Tuesday to inoculate over 4 million children with the polio vaccine.
• The sudden push follows three cases having been reported, including one that paralyzed a 10-year-old girl last month.
• Harare aims to disperse over 10 million doses over the course of February and March.

Zimbabwe began an emergency campaign to inoculate more than 4 million children against polio on Tuesday after health authorities detected three cases caused by the rare mutation of the weakened virus used in oral vaccines, including a 10-year-old girl who was paralyzed in January.

The health ministry said laboratory tests from samples collected from sewage sites in several areas of the capital, Harare, late last year showed the presence of a mutated polio virus that originated in an oral vaccine used in the global eradication effort.

In rare instances, the live polio virus in vaccines can mutate into a form capable of sparking new outbreaks, especially in places with poor sanitation and low vaccination levels.

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The number of polio cases globally has dropped by more than 99% since the global effort to wipe out the disease led by the World Health Organization and others began in 1988. But the majority of children being paralyzed by polio these days are being crippled by a virus that was originally linked to a vaccine.

Vaccination teams in Zimbabwe are moving from house to house to deliver more doses to protect children, while others will be stationed at health facilities, authorities said.

A baby is inoculated with a polio vaccine in Mogadishu, Somalia. (AP Photo/Ben Curtis, File)

Officials said it was the first time Zimbabwe would be using a new oral polio vaccine specifically designed to reduce the risk of the virus within it mutating into a dangerous form.

Zimbabwe aims to roll out more than 10 million new vaccine doses targeting just over 4 million children below the age of 10 in two rounds in February and March. More than 95% of that population needs to be immunized against polio to stop new outbreaks.

Last year, the wild polio virus caused a dozen cases in Afghanistan and Pakistan, the only countries that still have that virus. In comparison, polio viruses linked to the vaccine caused more than 500 cases in nearly two dozen countries globally, mostly in Africa.

Zimbabwe last reported a wild polio virus case in 1986, according to the United Nations children’s agency.

Zimbabwe Health Minister Douglas Mombeshora called the new detection of polio “a serious concern” but said they were prepared to respond swiftly. The health ministry said it was collaborating with health authorities in at least five other African countries that had recently detected polio viruses through environmental sampling and routine surveillance.

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Polio can cause total paralysis, and children under 5 are especially vulnerable. It is transmitted from person to person, mainly through contact with contaminated feces, water or food, as well as through droplets from a sneeze or cough of an infected person.