The World Health Organization is on alert after the discovery of the polio virus in London

Poliovirus, a disease that has been eradicated since 1999, has been identified several times in the sewers of a neighborhood in North East London between February and June 2022. The strain, derived from the vaccine, is the subject of all concern for the World Health Organization and English health authorities. Is there a risk of polio recurring?

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The London sewers contain traces of a disease that has been eradicated from most of the world poliomyelitis. On June 22, 2022, the British health authorities UK Health Security Agency (UKHSA), that they have identified and isolated type 2 poliovirus from water treated by a Becton wastewater treatment plant, an area in North East London.

It is not one of the “wild” strains of polio virus, the one that has been eradicated through a global campaign vaccination (The PV1 strain is the only one still in circulation in Afghanistan and Pakistan), but it is a strain derived from that used in manufacturing. Serum. We are talking about the polio virus derived from A Vaccine strain, or VDPV. In this case, it is specifically the poliovirus derived from the type 2 poliovirus strain, or VDPV2.

The polio virus has been isolated several times

This is not the first time that health authorities have identified VDPV in waste. Sometimes people are vaccinated against polio abroad and then return to England. The feces of the vaccinated people contain some viruses that end up in the sewers. ” As part of routine monitoring, it is normal to infect 1 to 3 polioviruses “like a vaccine” They are discovered every year in sewage samples In the UK, but these discoveries are still one-off and have not been discovered since ‘, he explains UKHSA in its press release.

What is abnormal here is that the virus was isolated twice, once in February 2022 and again in May 2022, at the Picton site. Attention , The World Health Organization also shared information. According to her, the dynasty identified today is related Evolution With that collected in February and May 2022.

The return of polio?

This finding is alarming to health authorities as it may be a sign of polio virus transmission between close people in the Picton area. So far, the virus has only been detected in environmental samples. No human samples have tested positive for this virus and no paralysis. sign of illness Typical of polio – identified. L ‘Who is the Determines that the criteria needed to certify the effective circulation of poliovirus have not yet been met.

The vast majority of people in England and around the world are vaccinated against polio, so there is little risk of the disease returning. UKSHA scientists consider the risks to public health to be very low, but still advise parents to review their children’s health records, as vaccination coverage It tends to be lower in the latter.

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