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Researchers Ask if Survivor Plasma Could Prevent Coronavirus

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Survivors of COVID-19 are donating their blood plasma in droves in hopes it helps other patients recover from the coronavirus.

And while the jury’s still out, scientists are now testing if the donations might also prevent infection in the first place.

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Thousands of coronavirus patients in hospitals around the world have been treated with so-called convalescent plasma including more than 20,000 in the US with little solid evidence so far that it makes a difference.

One recent study from China was unclear while another from New York offered a hint of benefit.

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We have glimmers of hope, said Dr. Shmuel Shoham of Johns Hopkins University.

With more rigorous testing of plasma treatment underway, Shoham is launching a nationwide study asking the next logical question: Could giving survivors plasma right after a high-risk exposure to the virus stave off illness?

To tell, researchers at Hopkins and 15 other sites will recruit health workers, spouses of the sick and residents of nursing homes where someone just fell ill and they’re trying to nip it in the bud, Shoham said.

It’s a strict study: The 150 volunteers will be randomly assigned to get either plasma from COVID-19 survivors that contains coronavirus-fighting antibodies or regular plasma, like is used daily in hospitals, that was frozen prior to the pandemic. Scientists will track if there’s a difference in who gets sick.

It if works, survivor plasma could have important ramifications until a vaccine arrives raising the prospect of possibly protecting high-risk people with temporary immune-boosting infusions every so often.

They’re a paramedic, they’re a police officer, they’re a poultry industry worker, they’re a submarine naval officer, Shoham ticked off.

Can we blanket protect them?

The new coronavirus has infected more than 7 million people worldwide and killed more than 400,000, according to official tallies believed to be an underestimate.

With no good treatments yet, researchers are frantically studying everything from drugs that tackle other viruses to survivor plasma a century-old remedy used to fight infection before modern medicines came along.

The historical evidence is sketchy, but convalescent plasma’s most famous use was during the 1918 flu pandemic, and reports suggest that recipients were less likely to die.

Doctors still dust off the approach to tackle surprise outbreaks, like SARS, a cousin of COVID-19, in 2002, and the 2014 Ebola epidemic in West Africa, but even those recent uses lacked rigorous research.

When the body encounters a new germ, it makes proteins called antibodies that are specially targeted to fight the infection. The antibodies float in plasma the yellowish, liquid part of blood.

Because it takes a few weeks for antibodies to form, the hope is that transfusing someone else’s antibodies could help patients fight the virus before their own immune system kicks in.

One donation is typically divided into two or three treatments.

And as more people survive COVID-19, there are increasing calls for them to donate plasma so there’s enough of a stockpile if it pans out.

In addition to traditional infusions, donations can be combined into a high-dose product.

Manufacturer Grifols is producing doses of that hyperimmune globulin” for a study expected to start next month.

Dr. Michael Joyner of the Mayo Clinic reported that Convalescent plasma seems safe to use.

His team tracked the first 5,000 plasma recipients in a Food and Drug Administration-sponsored program that helps hospitals use the experimental treatment, and found few serious side effects.

Does it help recovery? A clue comes from the first 39 patients treated at New York’s Mount Sinai Hospital.

Researchers compared each plasma recipient to four other COVID-19 patients who didn’t get plasma but were the same age, just as sick and being given the same amount of oxygen.

According to Dr. Sean Liu, the study’s lead author, people who received plasma before needing a ventilator were less likely to die than non-plasma recipients.

We tried to target patients early in their course, preferably within the first one to two weeks of their disease, Liu said.

Being a doctor during this time, you just feel helpless, Liu added, stressing that more rigorous study was needed but he was glad to have tried this first-step research.

Watching people die is, it’s heartbreaking. It’s scary and it’s heartbreaking.

But results of the first strictly controlled study were disappointing.

Hospitals in the hard-hit Chinese city of Wuhan were comparing severely ill patients randomly assigned to receive plasma or regular care, but ran out of new patients when the virus waned.

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