Hong Kong is poised to record nine more Covid-19 cases on Tuesday, with social-distancing rules including the four-person limit for public gatherings set to remain in force for another week, according to a medical source.The expected renewal of the measures until at least next Thursday came as leading microbiologist and government adviser Professor Yuen Kwok-yung made fresh calls for the mandatory testing of people with mild symptoms.Two Hong Kong schools closed as student among 11 new Covid-19…