China said Friday that it has effectively locked down Changchun, which has a population of around nine million, as the number of people newly infected with the novel coronavirus has been increasing in the northeastern city.The municipal government also said it has begun to carry out PCR tests on all citizens in the city, as the ruling Communist Party has pledged to continue implementing its radical "zero COVID" policy.Residents in Changchun are required to take PCR tests three times, with one family member allowed to go out to buy food and other daily necessities every two days. Corporate a…READ FULL ARTICLE