Real-life implications
“There is no such thing as 100% protection, even from the infection itself. So when you’re dealing with someone with possible exposure to COVID-19, you still need to follow the proper precautions,” Dr. Slifka said.
Nonetheless, he said, “This is great news for those on the front lines who are wondering whether or not they would have any protection if they had COVID-19 before. And the answer is yes – there is a very good chance they will have protection, based on this quite large study.”
One limitation of the study is that the population consisted predominantly of healthy adult health care workers aged 65 years or younger. “Further studies are needed to assess postinfection immunity in other populations, including children, older adults, and persons with coexisting conditions, including immunosuppression,” the researchers noted.
Dr. Eyre plans to continue following the health care workers in the study, some of whom have been vaccinated for COVID-19. This ongoing research will allow him and coinvestigators to “confirm the protection offered by vaccination and investigate how postvaccine antibody responses vary by whether you have had COVID-19 before or not. We also want to understand more about how long postinfection immunity lasts.”
Dr. Eyre has received grants as a Robinson Foundation Fellow and NIHR Oxford BRC senior fellow during the conduct of the study. Dr. Slifka and Dr. King report no relevant financial relationships.
A version of this article first appeared on Medscape.com.