In the biggest-ever public health responses, China has sent the military and thousands of healthcare workers into Shanghai to help carry out Covid-19 tests for all of its 26 million residents as cases continued to rise on Monday. According to news reports, some residents woke up before dawn for white-suited healthcare workers to swab their throats as part of nucleic acid testing at their housing compounds and many queued up in their casuals and standing the required two metres apart.