Millions of people in China returned to work on Monday after an extended holiday aimed at slowing the spread of a coronavirus, with the extra travel deepening contagion concerns as the death toll climbed above 900.At least 40 000 people have been infected by a new pathogen believed to have emerged late last year at a market in the central city of Wuhan.And although the World Health Organisation (WHO) has said there are signs the epidemic is stabilising, the agency's chief warned on Monday there could be more infections abroad in people who have never travelled to China.The comments from Tedros Adhanom Ghebreyesus came as a team of WHO experts departed for China, led by Bruce Aylward, a veteran of previous health emergencies.In an attempt to contain the virus, cities in Hubei province at the epicentre of the outbreak have been locked down and many transport links countrywide have been cut to stop the movement of hundreds of millions of people who usually visit family during the annual Lunar New Year break.READ | Coronavirus restrictions will likely hit air cargo industry too - aviation bodyThe holiday was officially extended by only three days but many cities and provinces pushed the date to February 10.The unprecedented measures have turned cities into ghost towns as people stay inside.But there were some signs of normality on Monday.https://t.co/By0KBr5HQV | No coronavirus cases confirmed in SA as 42 tests come back negative https://t.co/8xIzzL1j2W— News24 (@News24) February 7, 2020Roads in Beijing and Shanghai had significantly more traffic and the southern city of Guangzhou said it would start to resume normal public transport.However, for those at work, it was not an easy balance to strike."Of course we're worried," said a 25-year-old man surnamed Li in a Beijing beauty salon that reopened Monday."When customers come in, we first take their temperature, then use disinfectant and ask them to wash their hands."Ma Cunmei, a Beijing estate agent, told AFP she wanted to be ready for work because she believed many workers would have leases about to expire after being out of the city so long on the extended break.Work, interruptedTens of millions of people in Hubei did not return to work Monday as the province remained under lockdown.Even outside the quarantined region, many companies were limiting staff.ALSO READ | Hong Kong starts quarantine for mainland China arrivalsThe Shanghai government suggested staggered work schedules, avoiding group meals and keeping at least one metre away from colleagues.Many were encouraged to work from home and some employers simply delayed work for another week.State media reported that passenger numbers on the Beijing subway were down by about 50% Monday compared to a normal work day.https://t.co/By0KBr5HQV | Hong Kong starts quarantine for mainland China arrivals https://t.co/CGwi8CkNtT— News24 (@News24) February 8, 2020Large shopping malls in the capital were deserted and many banks remained closed.One bank employee in Shanghai was heading to work for a half-day, with other workers due to take over in the afternoon.The rest of the day he would work from home."It makes our work more difficult because we need to access the systems in our office," he told AFP.Schools and universities across the country remained shut.Difficult journeysThose returning to work faced fresh travel difficulties.The eastern city of Wuxi said anyone trying to enter the city from provinces with high numbers of cases would be "persuaded to go back", while Suzhou near the financial hub of Shanghai suspended all passenger transport to surrounding counties."I just checked and it would take 18 hours for me to go to work by bicycle," wrote one frustrated commuter on China's Twitter-like social media site Weibo.READ | Coronavirus chaos ravages Asia's sporting calendarOn Saturday travel authorities said there had been 11 million journeys by train, road or plane - 84% down on the same day last year.The tourism industry remains in the doldrums, with several countries banning arrivals from China, major airlines suspending flights and international and domestic tour groups halted. The Chinese foreign ministry said 27 foreigners had been infected in the country.