people coming from outside united states, from regions that has the new variant, the ommicron, you know, they still, they could have gotten infected. they say, you know, two days before they travel and they could test negative the day of the travel. they could become infectious to others two or three days or five days after. that is the latency period of the virus. i think it is a good idea for people to get tested after they have had international travel. they can get it easily in the united states at lots of testing centers for free. anchor: this person did that three days after coming back but that is not enforceable, is it? in the u.s., we do not have the tools to make anyone test if they don't want to three to five days after they get back, right? dr. wang: we live in a democracy and a civil society and part of that is the social contract that people need to feel that not only do they need to protect themselves but protect other people around them. we could encourage that in a civil society. anchor: all right. the third part of what president biden has said he will announce tomorro