An old idea for fighting infections — an approach most physicians know about only from medical lore — is being revived as people wait for drugs and vaccines to thwart the novel coronavirus. If it works, the blood plasma of people who have recovered from covid-19 would be used to protect health-care workers and help sick people get well.
Carolyn Y. Johnson and Ben Guarino write in the Washington Post that the possible therapy is based on a medical concept called “passive immunity.” People who recover from an infection develop antibodies that circulate in the blood and can neutralize the pathogen. Infusions of plasma — the clear liquid that remains when blood cells are removed — may increase people’s disease-fighting response to the virus, giving their immune systems an important boost. The approach has been used against polio, measles, mumps and flu.
The Telegraphreports that blood donated by patients who have recovered from COVID-19 will imminently be used as part of efforts to treat victims of the disease in NHS hospitals,  can disclose. Senior officials said the health service will start giving hospital patients plasma from those who have recovered from coronavirus, “in the very near future”, after the move was approved by the U.K. medicines watchdog.