Hong Kong parents should have their children vaccinated against respiratory infections as the city faces a triple threat from influenza, Covid-19 and respiratory syncytial virus (RSV), a medical expert has said.Dr Mike Kwan Yat-wah, an honorary clinical associate professor in the University of Hong Kong’s department of paediatrics and adolescent medicine, warned on Saturday that the current summer flu season had yet to reach its peak. His remarks came four days after the city recorded its first...