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Infect human beings through the respiratory route. so there was a phrase that grew up over the past eight years, ten years, gain of function research. and the gain of function they're talking about very specifically is to enhance the transmissability, and pathogenethicy. and we are talking, is it a good idea to do that? and not because you want to kill people but you want to prove that a certain virus could, with a few mutations, infect human beings. it was part of -- it was preventive medicine but it was preventive medicine that is taking an enormous risk. at least that is what the scientists...

Increased by 25%. the indian variant is the dominant strain. our health secretary said last week it's likely 3/4 of the new cases could be down to the indian variant map will happen? because lockdown is supposed to be lifted and all legal limits on social contact lifted on the 21st of june here in britain. will it be delayed because of the rise of the indian variant? that's a possibility. and there's a race against time with the vaccine effort. at the moment, 39 million people have received first dose of vaccine. about 25 the second toes. there's probably a three-week lag between two doses and...

Elderly, and those with preexisting or severe underlying medical conditions. >> and in the cases that have been found in eight countries, all have been linked back to the middle east. wolf? >> mary snow, thank you. let's bring back one of the world's leading experts on infectious diseases, dr. anthony fauci is still with us. how worried are you, dr. fauci, about this virus? >> well, as dr. lipkin said, you always need to be concerned when you have an emerging new infection. and you don't know what direction it's taking. important point to bring out, is that although there are family clusters, ...

Should we see this in the united states, within the united states, if it went from the middle east to europe, could it come here? >> well, it could come here, wolf, if someone has been in the middle east and gotten infected and came here, and a case came up. that would not surprise me. the thing that, again, to reemphasize is there has not been sustained person-to-person transmissability. although it's a threat, we don't know the degree of the threat. because if it's acting the way it's acting now and doesn't change. but if it assumes the capability of going more readily from person-to-person,...

Worry about. it's transmissible. that's the big concern. >> people paying attention to this should really keep that you are ears open for if we hear that the transmissability -- >> that's right. people now, in america, no. but traveler who is are going to china? yeah. they have to pay attention and doctors need to ask about travel. if someone's sick, wrfb you been? >> are you still surprised by things? the medicine is a constantly evolving field. like we said, we are always doing our homework. things change. >> yeah. >> advice changes as a result. how much does that affect how you report, how ...