BEIJING: Travelers from China now face restrictions when entering more than a dozen countries as concern grows over its surge in Covid-19 cases, with Australia the latest to demand a negative test before arrival. Last month, Beijing abruptly began dismantling its "zero-Covid" containment policy of lockdowns and mass testing, three years after the coronavirus first emerged in the city of Wuhan. As Covid overwhelms Chinese hospitals and crematoriums, officials have insisted that the wave is "under control" despite acknowledging that the true scale of infections is "impossible" to track. Get the latest news delivered to your inbox Sign up for…