The role of international travel in the fight against the coronavirus is being seen in mainland China where new cases of the infection have surged in just two days. Cases doubled in 24 hours as the number of infected overseas travellers surged and new asymptomatic infections more than quadrupled, pressuring authorities to tighten measures to stem local transmissions. New confirmed cases rose to 62 on Tuesday from 32 a day earlier, the National Health Commission said, the highest since March 25. New imported infections accounted for 59 of the cases. The number of new asymptomatic cases more than quadrupled to 137, the health authority said on Wednesday, with incoming travelers accounting for 102.
