The death of a 13-year-old girl from the flu over the weekend after failing to get vaccinated has raised alarm bells over the seriousness of the disease in Hong Kong. Some health experts warned on Tuesday that the existing flu season is expected to continue into November and urged the public to get vaccinated as a preventive measure. The Post looks at the different types of flu circulating in the city, what health experts say and how residents can protect themselves. What is influenza B? How is...