SINGAPORE - More than 5,500 workers have been tested as part of a pre-emptive Covid-19 testing operation across various dorms and worksites from last Friday to Monday (April 23 to 26), said the Ministry of Manpower (MOM) on Wednesday. The authorities are carrying out this precautionary measure following the cluster at Westlite Woodlands Dormitory which has seven cases so far, including five who were reinfected. In all, 26 residents at the dorm had tested positive for Covid-19, though of these cases, two subsequently tested negative while another 11 were assessed to be shedding virus fragments. These tests are in addition to the rostered routine testing conducted on dorm residents every 14 days, and includes both workers who have recovered from previous infections and workers who have never been infected, said MOM in a statement.