Testing in Southport for the South African strain of coronavirus is being extended after a second case was identified.
The case, which is not being linked to the first, was picked up following random sequencing of previous positive Covid-19 PCR tests.
As a result, the council say targeted testing, similar to that in Norwood, will now also be carried out in the Cambridge and Dukes wards.
The extra testing will effect around 9,000 residents and 12,000 homes, with mobile testing units set up to help.
Delivery and collection of home testing kits will also be rolled out in the new areas.
Councillor Ian Maher added: "So far I have been pleased to see how positive local residents and businesses in the Norwood area have reacted to the news about the South African variant by willingly participating in this important testing programme.
"I am confident people in the two new wards identified will work with us to help prevent its spread in the same way."
Testing in the Norwood ward, which started on Wednesday 3 February, will continue over the weekend.
WHERE CAN I GET A TEST IN NORWOOD?
There is a Mobile Test Unit at the former Kew park and ride site - open from 8am until 6.30pm
Home testing kits will also be delivered to households and businesses in the area.