Staff and residents in care homes in England will receive regular coronavirus tests from next week.
Staff will be tested for coronavirus weekly with tests every 28 for days residents over 65.
The testing policy, which begins on Monday, will also apply to younger patients suffering from dementia.
Any care home dealing with an outbreak, or at increased risk of an outbreak, will be more intensively tested.
Care sector experts say that repeated testing is crucial to containing the virus, following criticism of the government’s handling of the pandemic in residential homes.
There have been 14,658 deaths linked to Covid-19 in care homes registered up to 19 June in England and Wales, according to the latest Office for National Statistics (ONS) data.
Speaking on LBC, Prime Minister Boris Johnson said the government would “go over and look at” whether an earlier lockdown would have made a difference to the number of people who died in care homes.
“We will have to go back and look at the whole issue of what happened in care homes in great, great detail,” he said.
“I think what happened was absolutely tragic, there’s no question that we saw far too many lives lost in care homes and we mourn for everyone.”
A National Audit Office report last month said about 25,000 hospital patients were discharged into care homes in England at the height of the pandemic, without them all being tested for Covid-19.
Mr Johnson said he disagreed with claims that people were moved into care homes from the NHS to make space in hospitals.
“What we certainly wanted to do to was to ensure we had the space in the NHS, that’s absolutely right, but what I’m told is every decision to move people out of the beds in the NHS was taken on a clinical basis and not in any way intended to endanger the care homes.”
A government survey of almost 9,000 care home managers has identified high levels of the virus among care staff, particularly among temporary staff who work in multiple care settings.
The data, being published on Friday morning by the ONS, will show care home staff may be at increased risk of contracting the virus, which they may then pass on to others if they have no symptoms.
The regular testing process will begin next week across all care homes for over 65s and residents with dementia who have registered to receive retesting.
Health Secretary Matt Hancock said the new policy would give “certainty and peace of mind” to families who might otherwise be worried about their loved ones.
Care minister Helen Whately said: “Social care and its workforce are at the front line of this unprecedented pandemic with many of our care homes looking after those who are most at risk from coronavirus.
“It is our priority to protect care residents and staff and testing is a crucial part of that. This is so important as it means care workers can be sure they are providing the very best care without worrying if they are carrying the virus themselves.”
Care providers have also been advised of the importance of reducing movement between care homes to prevent the spread of coronavirus.
It comes as the Department of Health published detailed guidance to pubs, restaurants, cinemas and other venues reopening in England on 4 July on the best way to collect records of staff and visitors to help NHS contact tracers.
The information will be kept for 21 days and used to reach anyone who at a later date was found to have potentially been in contact with a positive coronavirus case.
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