"Unfortunately, as (the virus) spreads it can also mutate," he said in an interview https://cnb.cx/3p3KouT.
"Every time it mutates, it's almost like another click of the dial so to speak where we can see another variant, another mutation that can have an impact on its ability to fend of antibodies or to have a different kind of response not only to a therapeutic but also to a vaccine," he added.