professor of public health and the deputy vice chancellor of research and innovation at the university of choir zulu natal joins us now from dub and in south africa. and that may be all pick up on the point that our course. what it might, can, it was just making it is, there is a great deal we don't know about this mutation, but how does the way in which this variant behaves differ from mutations that we've seen in a virus so far? yeah, chris, in smyrna and sewer view or something from our end. what do we have noted is that there are specific mutations that we have seen before and those are in delta in be tied in some in alpha as well. but they're also mutations that we have not seen before, and unfortunately, the way this virus is behave, it depends on the combination of that constellation of mutation suite. we don't know exactly how it's going to behave, but so far what we're seeing is that there is a simmering repeat spread and we are also seeing that there is a re infection amongst people who i have been infected before as well as people who i've seen a tips, so the 2 concerns are on the ve