Discuss what this could mean for transmissibility and vaccine efficacy. And dr. Anthony fauci weighed in just a short time ago. Well, certainly, there is a new variant that is now in south africa, that has some mutations that are raising some concern, particularly with regard to possibly transmissibility increase, and possibly evasion of immune response. We dont know that for sure right now. This is really something that is in motion, and we just arranged right now a discussion between our scientists and the south african scientists a little bit later in the morning. So a lot we dont know. But this news is making the markets nervous, dow futures are down 800 points, with Travel Business being especially hard hit. With me, more on this. Nbc news foreign correspondent, and gary joins us live from a testing site in pennsylvania, and also with us dr. Peter hotez, codirector for the center for Vaccine Development at texas childrens hospital, and dean of the National School of tropical medic