The Wall Street Journal reports that Elon Musk has set up a COVID-19 antibody study at SpaceX. 4,300 SpaceX employees have signed up and a group has been tested for COVID antibodies.

The results have been made public in Nature Communications where Elon Musk has been listed as one of the co-authors.

Yahoo News writes that employees were notified via email asking for some to volunteer in an antibody study for COVID. Afterward, 4,300 signed up to give monthly blood samples to test them for antibodies.

Elon Musk along with Anil Menon, SpaceX’s medical executive, gathered different doctors and academics to design the study.

The study features data from April to June. But the test is still ongoing. They wanted to test if there are a number of antibodies that would provide immunity. They also worked to try to better understand COVID-19.

They found that people that had mild COVID-19 symptoms had you were antibodies which means that they most likely do not have long-term immunity and could get infected with COVID again. They further back this up by saying that recent tests have shown that workers have been reinfected. Those workers had a low number of antibodies in their system.

Dr. Alter backed the findings up by saying, “People can have antibodies, but it doesn’t mean they are going to be immune,” Dr. Galit Alter, one of the study’s co-authors and a professor of medicine at Harvard Medical School, told the Journal. “The good news is most of the vaccines induce [antibody] levels way higher than these levels.”

92% of the employees involved in the study were male with an average age of 31. The larger sample they used was 84.3% male with 32 as the average age. Out of 4,300 of the employees, 120 of them had tested positive and their blood tested to see how many antibodies they produced. 61% of them had no symptoms.