Twenty-one flu-related deaths have now been reported this season, according to updated data provided by New Hampshire health officials.The victims, who were all adults, were residents of Cheshire, Coos, Grafton, Hillsborough, Merrimack, Rockingham, Strafford and Sullivan counties. >> Download the FREE WMUR app Like in nearly every U.S. state, the flu is still considered to be widespread in New Hampshire, though the number of influenza cases in the Granite State was down 2 percent from last week.>> Additional information from NH DHHSNo New Hampshire children have died of the flu this season.Because of delays in the electronic filing of death certificates, the newly identified cases may have occurred at any point during the season and not necessarily within the last week.Officials said the illness is especially dangerous for the young, old and those with underlying health concerns.The flu is most contagious in the first 24 to 48 hours of infection, often before people realize they have it. Experts said that's why washing hands and covering coughs are so important.Those with the flu should stay home from school or work until they're fever-free for at least 24 hours. It's also not too late to get the vaccine, either as a shot or nasal spray.