>> the travel restrictions issue, the rules of the road are set by governments themselves and that is the call of governments. w.h.o. asks governments to do two things. one is to make sure they're risk based and make sure they're time limited. i think we need to keep two things in mind here. one is they're not a silver bullet. they can have limited effectiveness. secondly, they have side effects, south africa, this was a case of brilliant cutting edge science by south african scientists, transparency by the government. they should be rewarded the governments of south africa and botswana for transparency and that should be incentivized not punished. the scientist that was reporting this tweeted today because of the travel ban he can't get the reagents to keep being our eyes