"Blood from cured coronavirus patients could help treat infection ...People who have recently recovered from COVID-19 still have antibodies to the ...

"Blood from cured coronavirus patients could help treat infection ...People who have recently recovered from COVID-19 still have antibodies to the coronavirus circulating in their blood. Injecting those antibodies into sick patients could theoretically help patients better fight the infection."

https://www.livescience.com/blood-plasma-cured-patients.html