World Health Organization and Reuters support the claim that plasma therapy treatment is useful in treating patients with the severe viral infection.
Reuters reports that doctors in Shanghai are using infusions of blood plasma from the patients who have recovered from disease as they have permanent antibodies generated by the immune system floating in their blood plasma.
To turn that into a drug, the plasma is harvested, tested for safety, and purified to isolate those protective antibodies. Then it is injected into a new patient, this is called as the 'plasma-derived therapy' also known as convalescent plasma which provides 'passive immunity' this is administered to the patients until their immune system can generate its antibodies.
The COVID-19 pandemic has given rise to a lot of potentially dangerous misinformation. For reliable advice on COVID-19 including symptoms, prevention and available treatment, please refer to the World Health Organisation or your national healthcare authority.