Doctors are urging people to get their flu shots, if they have not already, as an unusually high number of cases has been reported nationwide for this time of year.>> Download the FREE WMUR appThe Centers for Disease Control and Prevention said New Hampshire is one of 30 states seeing some level of flu activity but it is not widespread here yet.Good hygiene and a shot will go a long way in defending against the flu.Physician’s assistant Joe Mangum, at CMC Urgent Care in Bedford, said it is never too late to get vaccinated.“We never know when flu season is going to hit, so sometimes it’s earlier in the year, sometimes it’s later: March, April and we’ve seen later than that,” Mangum said.Across the nation, flu activity is already ramping up, well ahead of the typical peak between December and February. More states are reporting higher activity this year than this time in each of the last 10 years.In New Hampshire, flu activity was considered “regional” earlier this month, which means there was increased influenza activity in more than two regions but in less than half of the state. But the New Hampshire Department of Health and Human Services said levels are back down to “local,” meaning increased activity in just a single region of the state.It is impossible to tell just how severe a flu season will be or what strain will afflict most people. But Mangum said getting vaccinated helps more than just the individual.“Little ones, elderly or people with underlying medical conditions, asthma, heart disease or other conditions where their immune system is down. So, it’s not just protecting you, it’s protecting the people around you, as well,” Mangum said.If flu symptoms do show themselves, including abrupt onset fever, body aches, chills, headache and respiratory problems, medical professionals urge people not to go to work. They urge people with symptoms to stay home and get plenty of fluids and rest.