this united airlines jet landing in london. the captain announced that the person had a suspected case of coronavirus and that we were all to keep in our seats. reporter: all 251 passengers were released, but it s just the latest false alarm for already jittery travelers. experts at home say the virus could last into next year. we want people to understand we likely will see more cases here in the united states. reporter: to combat the spread the u.s. announcing it will now test for covid-19 in five major cities in cases where flu tests were negative, in seattle, san francisco, los angeles, chicago, and new york. individuals who present with flu-like symptoms will also be tested for the china coronavirus. this will give us an early warning system in the united states. reporter: in china a wartime campaign to stop the virus. after cracking down on patients violating quarantine rules, now home fever checks and a mass roundup of people who could have the virus. and tonight we
very busy friday night. and we begin tonight with the coronavirus emergency. this evening the cdc now revealing new measures being taken in the u.s. today, we learned americans in five major cities with flulike symptoms will also be tested for coronavirus even if their flu tests are negative. it s a preemptive strike here at home coming amid increasing global alarm. passengers on a flight from the u.s. to the uk leaving from san francisco were told by the pilot someone on board might have coronavirus. one passenger said they were told to stay in their seats. it was never confirmed, but it was certainly alarming. and tonight china now revealing the virus has sickened more than 1,700 medical workers on the front lines. six have died. they re also expanding mass round-ups for people who may have the virus, not just confirmed cases. abc s maggie rulli leads us off in japan tonight with news on that cruise ship with americans on board and news on those tests in five major u.s. cities. rep
randy tarticoff is battling against the tide. we re all a little overwhelmed, not only the practitioners, but the caregivers in general. reporter: numbers are so great, he isn t even administering flu tests but handing out treatment. a lot of what we do is simple supportive care, making them feel better. reporter: the most vulnerable patients, children and the elderly. but this flu can also have deadly consequences for healthy adults. strong immune systems can sometimes overreact and destroy healthy tissues along with the flu itself. this year, there s a double threat. not only is flu rampant, so is a nasty stomach bug called the norovirus. now widespread throughout the country. it s also very contagious, and another serious concern for hospitals. a perfect storm of sickness, which is why 45,000 people in boston got an automated call from the city. residents who have not been varx vaccinated against
we re all a little overwhelmed, not only the practitioners, but the caregivers in general. reporter: numbers are so great, he isn t even administering flu tests but handing out treatment. a lot of what we do is simple supportive care, making them feel better. reporter: the most vulnerable patients, children and the elderly. but this flu can also have deadly consequences for healthy adults. strong immune systems can sometimes overreact and destroy healthy tissues along with the flu itself. this year, there s a double threat. not only is flu rampant, so is a nasty stomach bug called the norovirus. now widespread throughout the country. it s also very contagious, and another serious concern for hospitals. a perfect storm of sickness, which is why 45,000 people in boston got an automated call from the city. residents who have not been vaccinated against the flu this year are urged to get
those are predominant symptoms. jenna: personal experience with you. my husband had all the symptoms last week, terribly i can is. went to the doctors, they did the flu test. turns out they said he didn t have the flu. well those flu tests are only about 60% accurate why i don t always use them. if they re negative they don t mean you don t have the flu but your husband, from what you told me at different symptoms. he had stomach-like symptoms which probably weren t the flu. this make as really important point. everyone watching this is thinking do i have the flu, don t i have the flu? jon, do i have the flu? jon s a hypochondriac. he thinks we have everything we talk about here. jenna: poor jon. that is prevailing problem. if you feel well . jenna: if you have a stomach bug, got headaches and aches and temperature? you probably don t have the flu but a virus. call your physician. ask your doctor. if you re in a high-risk group, cronic illness, asthma, pregnant women, people ver