More than 85 per cent of Hong Kong infants and toddlers remain unvaccinated against flu, a leading respiratory disease expert has said, while warning of the approaching winter peak after more than 20 severe influenza cases were recorded among children, including two deaths. David Hui Shu-cheong, a professor of respiratory medicine at the Chinese University of Hong Kong, said on Sunday the summer flu peak was slowly receding and expected to bottom out by the end of November or the beginning of...