Surge testing is being deployed in the West Midlands after more cases of the South African Covid-19 variant were found.
The Department of Health and Social Care (DHSC) said additional testing was being rolled out in the DY4 postcode of Sandwell to help monitor and suppress the virus.
Positive cases will be sequenced for genomic data to help increase understanding of variants and their spread within these areas.
People living within the targeted area are strongly encouraged to take a Covid-19 test when offered, whether they are showing symptoms or not, the DHSC said.
It comes a day after the Camberwell area of south London - in the SE5 postcode - and in parts of Harrow, in the HA2 and HA3 postcodes, were also added to the list.
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While the London Borough of Southwark, which administers the SE5 postcode area, said a case of the variant had been found in the Faraday ward area, with the council delivering tests to properties.
People living in the south London areas of Battersea, Roehampton and Putney Heath were advised to get tested last week, also due to the South Africa variant.
The increased testing is being introduced in addition to existing extensive testing and, in combination with the public following current lockdown rules and Hands Face Space advice, will help to monitor and suppress the spread of the virus.
Surge testing has been deployed in multiple locations across the UK whenever cases of the South African, Brazilian and other mutations are identified.
According to the latest government figures, released on March 10, 234 cases of the South Africa variant and seven of the Brazilian one have been identified in the country.
Last month around 2,000 households in Bramley, near Basingstoke, Hampshire, received home test kits, before additional tests were also carried out in Southampton after a single case of the variant was found in the SO15 5 postcode area.
In early February, surge testing was also deployed in parts of Manchester after variant cases were identified.
There is no evidence that the South Africa variant causes more serious illness for the vast majority of people who become infected.
Scientists continue to work to update the current vaccines in order to offer better efficacy against various mutations.
