Research on the Brazil variant had been slow since its discovery in December, leaving scientists unsure of just how worrisome it is.
People who develop Coronavirus antibodies much less likely to test positive again for up to six months or more: Study
It was found that antibodies themselves may not be giving the protection, they might just be a sign that other parts of the immune system, such as T cells, are able to fight off any new exposures to the virus.
US sees first suspected case of coronavirus reinfection in Nevada's Reno; 25-year-old 'much sicker' than last time, officials say
Researchers said they were able to show that the virus associated with each instance of the Reno man's infection represented genetically different strains