The infected person exposed 17 people at 2 group homes to the disease.
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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In other outbreak developments, medical groups announce a vaccine allocation plan and a vaccine trial to begin in pregnant women and in children younger than 2.
The new UK mpox patient is another member of the index case's household.
Officials say the virus is highly infectious in households with close contact, so the illnesses aren't unexpected.
Clade 1b has spread to more Ugandan provinces, including some fishing communities.
In other developments, Bavarian Nordic announces the launch of a clinical trial of its vaccine in younger children, and the WHO adds 2 more tests through emergency listing.
The emergence of the B.1 in 2022 caused the global mpox outbreak, resulting in its detection in 116 countries/territories.
San Diego County officials said an area around 60 homes in Vista will be treated.
Officials said most patients are children ages 15 and younger and that low measles vaccine coverage and malnutrition may be contributing factors.
The case-patient recently traveled abroad, but few other details were given by the institute.
Safety and immunogenicity profiles were similar to those seen in adult studies.
