Philippine President Rodrigo Duterte said he will not allow students to go back to school until a coronavirus vaccine is available, even as some countries resume in-person classes. Children were due to return to school at the end of August after classes for more than 25 million primary and secondary students were shut down in March as the contagion took off in the Philippines. But in a speech aired late Monday, Duterte said the risk was too great, even if it held students back academically. Though researchers have launched an unprecedented global effort to quickly develop a vaccine, it is not clear when a viable candidate will be proven and distributed on a large scale. Public school normally runs from June to April in the Philippines, but authorities pushed back the start as cases rose and a strict lockdown brought most of the nation to a halt. In order to ease classroom crowding, the education ministry had already announced a mix of distance-learning measures, including online classes, would be used for the coming school year//JP