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This March 2020 photo provided by the family shows Ming Wang in Sydney, Australia. (Lu Wang via AP)

Through desperate efforts to save their lives, scientists now better understand how to treat and prevent the disease — and millions of others may survive.

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 In this Friday, June 12, 2020 file photo, a doctor holds a bag of blood plasma donated by a COVID-19 survivor at a blood bank in La Paz, Bolivia. (AP Photo / Juan Karita)

A group of medical experts advising the National Institutes of Health says there is not enough evidence to recommend for or against the use of plasma therapy for patients hospitalized with COVID-19.

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Protesters and supporters of President Donald Trump wave banners as the president's motorcade enters the Trump National Golf Club in Sterling, Va., Sunday, Aug. 23, 2020. (AP Photo / Manuel Balce Ceneta)

After expressing frustration at the slow pace of approval for coronavirus treatments, President Donald Trump announced Sunday the emergency authorization of convalescent plasma for COVID-19 patients.

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 In this Friday, June 12, 2020 file photo, a doctor holds a bag of blood plasma donated by a COVID-19 survivor at a blood bank in La Paz, Bolivia. (AP Photo / Juan Karita)

Mayo Clinic researchers reported a strong hint that blood plasma from COVID-19 survivors helps other patients recover, but it’s not proof and some experts worry if, amid clamor for the treatment, they’ll ever get a clear answer.

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Weiss Memorial Hospital (WTTW News)

Researchers are studying the use of convalescent plasma therapy — and it’s already showing positive results at Weiss Memorial Hospital in Uptown.

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(U.S. Air Force photo / Airman 1st Class Andrew Moua)

Patients who have recovered from the coronavirus can help those struggling to fight the disease, as part of a clinical trial just launched by University of Chicago Medicine – the first trial of its kind in the area.