she's a senior lecture and global health advisor at the university college of london school, a pharmacy at santa. we are going to look at all this from the, from the health standpoint. ok. china's policy for 3 years now has been to achieve 0 covey cases. is that still achievable? well we see that co, that is now we're in multiple re infection in every country in the world. so it is an endemic stage. so the longer that china, which doesn't have a very low coverage rate of infection compared to every other country. as a result of that, it actually has a big vulnerability because they haven't built up as many tools against it. ok, hold on, expand on that. what do you mean tools? are you talking about vaccinations? are you talking about immunity within the population? well, the immunity got results from both so you can have it. and in both cases, we know that whatever you receive from the natural infraction, or if you get vaccinated, that protection weighs over time anyhow. so that is 10. this is why we have boosters available. and now this new by dealing booster that both a pfizer and the