A single dose of convalescent plasma from recovered COVID-19 patients led to viral clearance, clinical improvement, and lung lesion improvement within seven days in one study.

“A study of 10 patients in China found a single dose of convalescent plasma from patients that have recovered from COVID-19 and contained antibodies against SARS-CoV-2 resulted in a clearing of the virus in the patient's blood within seven days, clinical symptoms improved significantly within three days, and lung lesions improved within seven days.”