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Two monkeypox strains in US suggest possible undetected spread

Many of the US cases were caused by the same strain as recent cases in Europe, but a few samples show a different strain, federal health officials said.

Two monkeypox strains in US suggest possible undetected spread

New York: Genetic analysis of recent monkeypox cases suggests there are two distinct strains in the US, health officials said on Friday, raising the possibility that the virus has been circulating undetected for some time.

Many of the US cases were caused by the same strain as recent cases in Europe, but a few samples show a different strain, federal health officials said.

Each strain had been seen in US cases last year, before the recent international outbreak was identified.

Analysis from many more patients will be needed to determine how long monkeypox has been circulating in the US and elsewhere, said Jennifer McQuiston of the Centers for Disease Control and Prevention.

“I think it's certainly possible that there could have been monkeypox cases in the United States that went under the radar previously, but not to any great degree,” she told reporters Friday.

Monkeypox typically begins with a flu-like illness and swelling of the lymph nodes, followed by a rash on the face and body.

The disease is endemic in parts of Africa, where people have been infected through bites from rodents or small animals.

It does not usually spread easily among people.

Last month, cases began emerging in Europe and the United States. Many, but not all, of those who contracted the virus had travelled internationally, and health officials in a growing number of countries are investigating.

As of Friday, the US had identified at least 20 cases in 11 states. Hundreds of other cases have been found in other countries, many apparently tied to sexual activity at two recent raves in Europe. 

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