here's deborah patta. >> reporter: japan is scrambling to prevent the 70 cases of coronavirus on the princess diamond cruiseship, moored at yokohama from becoming a far bigger outbreak. there is a lot at stake. the country is preparing to welcome visitors to the olympic games had in tokyo this summer and needs to show it can contain the infection. at least 13 americans are among the confirmed cases on board. all passengers are confined to their rooms. >> we're certainly prepared to do the 14 days. but i don't think it's even safe to be here. >> reporter: hong kong is also taking no chances at its borders. now travelers not only from wuhan but anywhere in mainland china would have to submit to a 14 day quarantine monitored by g.p.s. enabled wristbands. in hubei china the epicenter, over 50 million people remain under seige. china is being criticized for failing to respond to early warnings about the coronavirus. dr. li wenliang who died was silenced when he sounded the alarm about a virulent new virus infecting people late last year. chinese ambassador cuue on "face the nation." >> i

deborah patta, cbs news, tokyo, japan. . >>> for the latest developments on the coronavirus, outbreak, you can head to the website, kpix. com or watch the 24 hour streaming service. cbsn bay area on the favorite app. >>> an update on air quality testing in oakland. early results show no evidence of tce in the air at school. tce is a common industrial solvent found in the ground water under the high school. the chemical was not found in the drinking water but the discovery shut down mcclymonds on thursday and friday. more test will go happen this week. and the school will remain closed tomorrow. >>> dry wipter is raising concerns about another potential drought here in california and the bay area. with little rain so far in february, the federal drought monitor says 59% of california is experiencing "abnormally dry conditions. a comparison of maps from december and this week shows the areas of dryness expanding dramatically. >>> let's get a check the no rain in the forecast today either. >> no. and the way it looks, not for the rest of if he can february. lote let me follow up on that

deborah patta is in yokohama. >> reporter: the situation on board the diamond princess deteriorated thiskend with a surge in infections prompting the u.s. government to evacuate its citizens. the ship has been quarantined for over ten days here in yokohama. but that has now ended for many of the nearly 400 americans on board. earlier buses arrived at the japanese port to ferry them to chartered planes waiting at haeda airport in tokyo. with their bags packed, they were desperate to go home. but that could still take some time. although they will be on u.s. soil by monday, they will be quarantined for a further two weeks. anyone showing symptoms of the virus was not allowed on the flight. in hubei province, china, the epicenter of the epidemic, over 50 million people have been in lockdown for over three weeks. megan munroe, a training teacher from california is still in the provincial capital of wuhan confined to her apartment. she chose not to leave. >> i decided that i would be safer locked in my own apartment than being on a plane with 200 people. >> reporter: on the diamond princess s

. >> deborah patta for us in hong kong. >>> new hampshire votes tomorrow in the first in the nation primaryto be the last stand for some democratic candidate. cbs news battleground tracker shows senator bernie sanders leading the field, followed closely by mayor pete buttigieg, and one week after the iowa caucuses, the democratic party finally revealed mayor buttigieg won the most delegates. with 14 to sanders' 12. ed, good morning. are the candidates changing their strategies? >> reporter: good morning, tony. they sure are. polls will be open 24 hours from now and attacking each other like never before. senator sanders and mayor buttigieg going after each other on policy and how they are raising campaign cash and joe biden is making a last ditch attempt to save his campaign. >> this is, i think, what winning feels like. >> reporter: the current front-runners former mayor pete buttigieg and senator bernie sanders blanketed the air waves sunday and spent most of the day attacking each other. >> pete has raised campaign contributions from over 40 billionaires. >> reporter: buttigieg hit back