Twenty-three cases of a South African COVID variant have been found in a South London care home, according to the BBC.
The outbreak at the unnamed care home is believed to have been caused by an individual who travelled from Africa in February.
The individual is thought to have spread the virus to members of their household and the care home despite self-isolating and requesting a home test after showing symptoms.
Thirteen residents and 10 staff members at the care home are believed to have been infected.
Six of the 10 residents are believed to have received a dose of the AstraZeneca vaccine two or more weeks before testing positive.
Additionally, one of the infected staff members had a single Pfizer vaccination two or more weeks before testing positive, the report said.
Surge testing began in Wandsworth and Lambeth after 44 confirmed and 30 probable cases of the variant were discovered.
Dr Susan Hopkins, Chief Medical Adviser for NHS Test and Trace said: “The cluster of cases of the variant first identified in South Africa found in parts of South London, predominantly the Lambeth and Wandsworth areas, is significant. It’s really important people in the local area play their part in stopping any further spread within the local community.
“PCR testing is now available for all and I would strongly encourage everyone, whether they live, work or travel through the boroughs, to get tested even if they don’t have any symptoms of coronavirus.
“Around 1 in 3 people with COVID-19 don’t show any symptoms. By taking part you can protect yourselves and your loved ones and help us identify any possible new cases that would otherwise be missed, preventing further transmission and saving lives.”