I saw a related study and commentary earlier this week

There was a study released earlier this week that the article may be referring to. I read some commentary that had a few take aways.

First, this isn't necessarily positive or negative. All this means, with what we currently know, is that the virus many not be novel for some people. So while they may have had exposure to a similar virus at this point it isn't definitive as to whether this will help those people fight off infection.

Second, if this is true this could actually make it more difficult to develop and test a vaccine. To be honest some of the reasoning for this is above my expertise. Simply passing along what I read.

Related study is linked.

Click here for link at https://science.sciencemag.org/content/early/2020/08/04/scie