HCM City tightens COVID regulations as city caseload increases stockbot 0 67 2022.03.02 15:44 http://vietnamnews.vn/society/1160569/hcm-city-tightens-covid-regulati… + 5 https://vietnamnews.vn/rss/society.rss + 5 If more than half the students in any classroom in a school test positive for COVID-19 or were in contact with a patient, the entire class has to switch to online lessons, the HCM City Department of Education has said.