The findings underscore the need for more education as some sexually transmitted infections increase, the authors say.
The test the US Centers for Disease Control and Prevention uses to identify clade I mpox cases is 'most likely not reliable' for detection of the substrain identified in the study, the authors say.
Another mpox study today showed that dose-sparing vaccine administration of the Jynneos vaccine appeared to have worked.
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Officials have deployed 72 epidemiologists to affected countries to get a better idea of where and how mpox is spreading.
No one who was vaccinated was hospitalized with the viral disease.
The plan sets out a strategy for the next 6 months, with an estimated $135 million needed for support.
More than 25% said they had misdiagnosed someone initially.
In an update, the WHO notes widespread activity across Burundi, including in an urban area.
The patient is a 66-year-old European man who had arrived in Thailand last week from an unspecified African country.
The new funding brings US support for the outbreak response to $55 million.
As more groups offer vaccine donations, cases are spiking in Burundi, one of the newly affected countries.
The report contains temporary recommendations, such as regulatory consideration of mpox vaccine approval and planning for vaccine campaigns.
The ECDC said the risk is high for those who have close contact with affected communities and moderate for people who are contacts of imported clade 1 cases.
