A Californian man who recovered from COVID-19 has donated his plasma to help others fighting the potentially deadly virus.

On March 6, Jason Garcia noticed he had a mild cough and some congestion.

Watch the video above

The 36-year-old aerospace engineer from Escondido, California, didn’t think that much of it.

But later while on a work trip, he noticed a headache had begun accompanying his cough.

Within a day, he also had a fever and body aches that quickly came and went.

Then he began experiencing shortness of breath.

Garcia called his doctor and based on his symptoms was told to go to the hospital and get tested for coronavirus.

Testing positive

He was sent home and received a call on March 14 letting him know he had tested positive.

“They said stay isolated,” Garcia said.

“That’s what I did.”

He spent nearly 10 days inside his home, confined to his office or his guest room, staying away from his active-duty Navy wife and their 11- month-old daughter.

File image of medical workers taking in patients at a special coronavirus intake area in the US. Credit: Spencer Platt / Getty Images

He started to feel better and on March 18, he said, he considered himself “symptom free.”

He received a letter from the county of San Diego saying that it was safe for him to come out of isolation and rejoined the world on March 23.

Garcia said although the protocol for coming out of isolation was 72 hours without symptoms, he wanted to be extra careful. “I decided to do five days just to be safe,” he said.

Victory over the virus

To celebrate his recovery, he posted on social media to let his friends know he had been infected with coronavirus and was better.

“I claimed victory over this deadly virus. I won over COVID-19,” Garcia said he wrote.

Around the same time, health officials in California looking for someone who had recovered from the virus and was willing to take part in an experimental treatment.

In the video below, A look inside Perth hospital ICU.

Play Video A look inside a Perth hospital ICU where COVID-19 patients will be cared for. A look inside a Perth hospital ICU where COVID-19 patients will be cared for.

The treatment would potentially save the life of another coronavirus patient.

A friend who saw both social media posts reached out and the hospital called Garcia just a few days after his quarantine had ended, he said.

Potentially lifesaving donation

They asked him for a plasma donation to be given to a coronavirus patient who was in dire condition and unresponsive to other treatments, Garcia said.

He said yes.

“This can be turned into a lifesaving opportunity for someone who can’t fight off this disease,” Garcia said.

The plasma donation will allow the current coronavirus patient to receive antibodies from Garcia, a recovered patient, to help fight the disease, Wendy Escobedo, director of nursing for renal services at St. Joseph’s Hospital said in a video provided by the hospital.

File image of sailors on the USNS Mercy in Los Angeles look after patient. Credit: Handout / Getty Images

On April 1, Garcia donated his plasma for experimental transfer into three patients.

As of Sunday doctors told him that all of his plasma has been donated.

The patient who was in the worst condition has since improved, Garcia said doctors told him.

More on 7NEWS.com.au

The patient who was taken off some medication is healthier in terms of oxygenation and is doing incrementally better day by day, a spokesperson for the hospital said.

“When I was diagnosed, the feeling of dread and fear, the fact this was a positive,” Garcia explained.

“This thing ended up possibly saving someone’s life.”

File image of Wuhan Internacional Conference and Exhibition Center. Credit: Getty Images / Getty Images

Although Garcia doesn’t know how he became infected with the virus, he’s glad he might contribute to a treatment until a vaccine is ready.

“If this works there’s going to be an awesome chance for people to save a lot of heartache for others and fight the fight for their lives.”