People who have been told they are at high-risk from catching coronavirus must stay "three steps away" from everyone else inside their home.
Those with pre-existing health problems have been warned that they cannot leave the house for the next three months - even for food or medicine - and must only open a window for fresh air.
Instead, they are encouraged to rely on friends and family and charity as the NHS and government attempts to slow down the coronavirus outbreak and protect those more likely to be hospitalised.
A text message sent by the NHS tells people to open a window for fresh air.
The restrictive guidance means they must also minimise personal contact by staying two metres away from anyone they share their home with.
The text sent out says: "NHS Coronavirus Service: We have identified that you're someone at risk of severe illness if you catch Coronavirus.
"Please remain at home for a minimum of 12 weeks. Home is the safest place for you.
"Staying in helps you stay well and that will help the NHS too.
"You can open a window but do not leave your home, and stay 3 steps away from others indoors.
"Wash your hands more often, for at least 20 seconds."
Recipients will include people who have received an organ transplant, those with respiratory conditions such as cystic fibrosis, and with some cancers such as those of the blood or bone marrow.
They also include some patients receiving certain drug treatments - including those which suppress the immune system and stop the body from fighting off the virus as effectively.
This guidance means that people should minimise the time spent in shared spaces and must keep them well-ventilated.
If possible, any vulnerable person should use a separate bathroom from the rest of the house and use their own towels.
If not, the bathroom must be cleaned after use every time.
And the partner of a vulnerable person is encouraged sleep in a different bed, if possible.
hereIt comes as the coronavirus death toll rose again this weekend to more than 280.
According to the NHS, a further 37 patients in England, seven patients in Walesm a further three in Scotland and one patient in Northern Ireland passed away.
Now stricter curbs are expected as Brits have failed to heed the Government advice to stay in.
Countries such as Spain and Italy have introduced lockdowns with citizens banned from going out except for a limited number of reasons.
In a stark warning to stay two metres away from other people, prime minister Boris Johnson said yesterday: "If we can't do that then I'm afraid we're going to have to bring forward tougher measures."
