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News > U.S.

US Halts Trials of COVID-19 Convalescent Plasma in Patients

  • A soldier donates blood plasma in Radom, Poland, Nov. 10, 2020.

    A soldier donates blood plasma in Radom, Poland, Nov. 10, 2020. | Photo: EFE

Published 3 March 2021

Investigators found no benefit in the application of convalescent plasma in patients with mild-to-moderate COVID-19 symptoms.

The U.S. National Institutes of Health (NIH) has halted a clinical trial evaluating the safety and effectiveness of COVID-19 convalescent plasma in treating emergency department patients who developed mild to moderate symptoms.


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An independent data and safety monitoring board met for the second planned interim analysis of the trial data, and determined that while the convalescent plasma intervention caused no harm, it was unlikely to benefit this group of patients.

Launched in August last year, the trial was being conducted at 47 hospital emergency departments across the United States and had enrolled over 500 participants.

COVID-19 convalescent plasma is blood plasma derived from patients who have recovered from COVID-19. It contains antibodies, or special proteins, generated by the body's immune system to fight the novel coronavirus.

Over 100,000 people in the United States and many more worldwide have already been treated with it since the pandemic began, according to the NIH.

The trial reviewed the effectiveness of COVID-19 convalescent plasma in adults who came to an emergency department with mild to moderate symptoms they had for a week or less.

These patients also had at least one risk factor associated with severe COVID-19, such as obesity, hypertension, diabetes, heart disease, or chronic lung disease, but none were ill enough at the time to be hospitalized.

After the study participants received either the COVID-19 convalescent plasma or a placebo, researchers tracked whether the participants needed to seek further emergency or urgent care had to be hospitalized or died within 15 days of entering the trial.

The recent data analysis from the study indicated no significant difference in the proportion of participants who experienced any one of these outcomes.

"Even if enrollment continued, this trial was highly unlikely to demonstrate that COVID-19 convalescent plasma prevents progression from mild to severe illness in at-risk emergency department non-hospitalized participants," said the NIH.

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