BBC2 May 2020 08:47
More than 6,500 people have registered their interest to take part in a UK trial to see if blood plasma from coronavirus survivors can treat hospital patients with Covid-19.
The hope from the trial, which has now started, is that the antibodies recovered patients have built up will help clear the virus in others.
Last week, NHS Blood and Transplant began collecting blood from survivors.
In England, 148 people have donated so far.
Researchers are going through NHS data to find other people who have tested positive for coronavirus.
They will phone them to ask if they wish to be involved.
Donating takes about 45 minutes, as the blood is filtered through a machine to remove the plasma. The process is technically known as plasmapheresis.