A vaccination campaign for residents and workers in Meanchey, Por Sen Chey, Dangkor and Kambol districts kicked off on May 1, with priority given to those in red zones. - Phnom Penh Post/ANN PHNOM PENH, May 2 (Reuters): Cambodia's army began a drive to vaccinate nearly half a million people in the parts of Phnom Penh worst-hit by Covid-19, as the South-East Asian nation looks to step up the pace of inoculations. The country, which had been one of the least affected by the pandemic, is fighting a surge in coronavirus cases that has seen the total number of infections jump from about 500 to 13,790 since late February, including all 96 of the deaths it has recorded.