joining us is professor jennifer rohn. how many people do we know have had the virus? a second wave and we used to talk about herd immunity. how many people are immune? jennifer: there are new antibody tests that detect prior infection and the news is not great. only one in 10 people have been exposed, leaving 90% people vulnerable. francine: what are the risks of a second wave? if you reopen the economy, and this is a balance between economists and scientists, but could it be as bad as it was early march or does it gradually come down if we social distance? jennifer: it is not a question of whether there will be a second wave. there will be one. if you have a robust contact tracing and quarantine -- testing and quarantine and contact tracing, if you have that nailed, you are in a good position but if you let people out without following them up, we could be back where we started. this is not really the end, this is the beginning. tom: it has been a most difficult week. glimmers of good news out of germany. "the washington post" puts a chart on their cover every day an

rohn who is cell biologist at ucl. she joins us from kent. a very, very good morning to both of you. lots of veryu interesting questions coming in from our viewers. jennifer asks what arrangements do we have in hand to be able to manufacture a covid vaccine in sufficient quantities for use within the uk if and when it is available? i think everybody agrees this will be a logistical nightmare. it is a very, very big job to upscale a vaccine to a country, let alone the world. what we are seeing is a lot of different vaccine candidates in the race. we do not know which one will win and that is unfortunate because every different kind of vaccine type has a different way production so it is hard to prepare a factory if you don't know which production method will win. having said that, the world health organization is really rallying and trying to get countries to work together and even millionaires and billionaires like bill gates are throwing money at the problem. sol hope this global effort will result in a quick upscale for this vaccine ever comes. if a country is manufacturing a vaccine candidate which turned out to be successful, for example the one being

rohn, who's a cell biologist at ucl, she's in gravesend in kent. are very good morning to both of you, lots of very interesting questions coming in from viewers on this. jenniferements do we have in hand to be able to manufacture a covid vaccine in sufficient quantities for use within the uk if and when it is available? good question. thanks for your question, good morning. ithink everybody agrees this is going to be a logistical nightmare. it is a very, very big job to upscale a vaccine to immunise a country, let alone the world. so what we are seeing is a lot of different vaccine candidates are in the race right now, we don't know which one is going to win, and that is u nfortu nate, going to win, and that is unfortunate, because every different vaccine type is a different type of production, so you can't prepare a factory if you don't know what method is going to win. having said that, the world health organization is really rallying and trying to get countries to work together, even billionaires like bill gates are throwing money at the problem, so i hope that this global effort will result in a relatively quick upscale for this vaccine if it comes. polite