Hong Kong continues to see a declining trend in coronavirus cases, with about 28 cases expected on Friday, according to medical sources.The latest figures come ahead of the launch of citywide testing next month, details of which are to be announced by government officials on Friday afternoon.Hong Kong recorded 18 new Covid-19 cases on Thursday, partly because of the suspension of samples collection on Wednesday due to Typhoon Higos.The number of confirmed cases stands at 4,604, with 75 related…