RELATED: UN health agency says no COVID-19 vaccine will be endorsed before it's safe and effective“There was definitely a lot of wishful thinking that there was going to be a magical test that was going to save us all, but we’re not there yet,” said Dr.
Jennifer Rakeman of New York City’s Public Health Laboratory.The tests check the blood for antibodies the body makes to fight off an infection.
Scientists are still working to figure out how well antibodies for the coronavirus may shield someone from another infection, or how long that protection might last.
Some early studies suggested any immunity fades fast; research published last week was more promising, suggesting that antibodies last at least four months after diagnosis and do not.