The length of time people in England with coronavirus symptoms have to self-isolate for is set to be increased to 10 days.
Currently, those who have a new continuous cough, high temperature or loss of taste or smell, have to seclude themselves for seven days.
But Health Secretary Matt Hancock is expected to announce on Thursday that the period is being extended.
It comes after the prime minister warned of a second wave of infection.
It is unclear if the devolved nations will follow the UK government’s lead, but the current guidance was adopted UK-wide.
The UK requirement for people who test positive to isolate for seven days was always on the low side – plenty of other countries require 10 days or even longer.
As coronavirus is new, there is a lack of certainty over how long someone remains infectious.
Research shows a person can be infections two days before symptoms develop and carry on being infectious during the period they have symptoms. For most, that lasts no more than seven days.
Those who have symptoms longer are already advised to carry on self-isolating.
But the decision to insist everyone isolates for 10 days is likely to have been made for a number of reasons.
There is plenty of evidence that people continue to shed the virus after symptoms end – although the degree to which this represents a risk of passing on the infection to another person is not clear.
Another factor that may have played a role in the decision is that widespread testing is beginning to pick up people in the asymptomatic stage.
Under the current rules those who share a household with someone with symptoms of Covid-19 should self-isolate for 14 days.
Those returning to the UK from certain countries are also being asked to quarantine for 14 days – a move that has sparked complaints from travel firms.
According to the Daily Telegraph, ministers are also looking for a way to reduce the current 14-day quarantine period for arrivals to the UK, meaning that quarantine and self-isolation time periods could be standardised.
What are the current rules on self-isolating?
Self-isolating means staying at home and not leaving it.
People who have symptoms of coronavirus should isolate themselves for seven days and arrange to get tested. Symptoms include:
- a loss of, or change in, your normal sense of taste or smell
Other members of their household should isolate for 14 days and not leave their homes.
If you test positive you will be contacted by contact tracers, who will establish who else you might have passed on the infection to.
Anybody they deem to be at risk will have to isolate themselves for 14 days from the point of contact.