Chinese health authority on Thursday confirmed reports of 28 new COVID-19 cases on the mainland on Wednesday.   Four of these are imported while the rest are domestically transmitted, reports Xinhua.   Of the domestically transmitted cases, 21 were reported in Beijing, two in Hebei Province, and one in Tianjin, the National Health Commission said in its daily report.   No COVID-19 related death was reported Wednesday. Fifteen people were discharged from hospitals after recovery.   So far, the total confirmed cases on the mainland stands at 83,293. Of them, 265 patients are still being treated – nine of them are in severe condition.   Altogether 78,394 people had been discharged after recovery and 4,634 people had died, the commission said.