Though the surge in Sierra Leone has received much of the attention, cases are also rising in two other countries in West Africa: Ghana and Liberia.
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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Walensky says clinicians must ensure proper screening and counseling are taking place.
Indications of high viral loads were detected in all 12 saliva samples, and DNA was found in 7 of 9 semen samples.
Many men who have sex with men are seeking vaccine that is so far in short supply in the US and Europe.
At the current rate, UK monkeypox cases are doubling every 15 days.
Also, the CDC is partnering with Mayo Clinic to begin conducting tests for the virus.
Parties, bath houses, saunas, and other mass-gathering sites have been implicated in transmission.
WHO data show that, among monkeypox patients with known HIV status, 41% are HIV-positive.
"Testing remains a challenge, and it's highly probable that there are a significant number of cases not being picked up."
All but 3 of 52 patients had lesions and rashes on their genitals or anal regions.
Europe's cases have tripled over the last 2 weeks, and US cases approach 400, with New Hampshire and Puerto Rico reporting their first cases.
