(iv) Convalescent plasma or immunoglobulins:
Plasma therapy has been made world headline as one of the most successful treatment against Covid-19. Convalescent plasma has been used for passive immunization because it contains antibodies against coronavirus in recovered individual.
The Drug Regulatory Authority of Pakistan approved clinical trials for this therapy. Some hospitals of Pakistan have begun to use this therapy for severe patients of Covid-19 (Ahmed, 2020).