Worldwide (Bloomberg Opinion) — Another study released this week bolstered the evidence for post-infection immunity by attempting to deliberately infect monkeys twice.
The monkeys resisted a second infection trib.al/TLI8uh8.
There’s lots of new information on how our bodies cope with Covid-19.
The researchers compared 10 people who had been infected with 11 control subjects and determined that those who had fought off infections were armed with not only antibodies but also with CD4 cells, sometimes called a helper T-cells, which are important for getting a good antibody response. They also retained CD8 cells, or killer T-cells, which kill cells that are infected with the virus.
It’s reasonable to assume most people who’ve had Covid-19 are less likely to be re-infected, and less likely to get a severe case if they do, says Florian Krammer, a professor at the Icahn School of Medicine at Mount Sinai and co-author of the paper.
Another study released this week in Science bolstered the evidence for post-infection immunity by attempting to deliberately infect monkeys twice. A week after the monkeys recovered from an initial infection induced by spraying particles of virus into their noses, the researchers again exposed the monkeys to this same “challenge.” The monkeys resisted a second infection. That group, led by Harvard’s Dan Barouch, also performed a similar challenge study on monkeys that had not been previously infected but had been given an experimental vaccine based on DNA that holds the code for viral proteins needed to stimulate the immune system. Those monkeys, too, resisted getting infected. Those results were published in a second Science paper.