all right, troy stangarone _ preventive levels.all right, troy stangarone from the _ preventive levels. all right, troy stangarone from the korea - preventive levels. all right, troy - stangarone from the korea economic institute in washington, thank you very much your time. stay with us on bbc news. still to come: a shock defeat for the world's top tennis player. novak djokovic is knocked out in the olympic semi finals. a covid outbreak in china has spread to five provinces and at least 13 cities, including beijing. recorded cases are so far low, with only around 200 people infected. but according to state media, this represents china's worst outbreak since wuhan in 2020. this moment, there is an almost emergency mode in china and people being tested in large cities. china's approach afar is still trying to reach zero tolerance of infections, but whether in this day and age that is still a feasible way to go is the question right now. the moment he realised there was infection, i think dozens of flights at the airport were grounde