While the vast majority of people will recover without any serious complications, not everyone is so lucky.
Previous year flu activity wasn't considered "widespread" until mid-January.
Everyone 6 months and older should get an annual flu vaccination, with rare exceptions, according to the CDC.
"We are still wanting people to get the vaccine, simply because there are still some strains that can be prevented".
The new findings mean that even more people will be able to get their recommended flu shot without sacrificing peace of mind.
"I think there are fears this can be a worse flu season".
Dayton Children's admitted its first child with flu symptoms this season during the week of December 4 but OH hasn't seen any pediatric deaths so far.
"What usually happens is that it takes two to three weeks for the vaccine to take hold, so either they came in with the flu and they got the influenza vaccine, or they got the flu during the time, while they were waiting for the antibodies to respond", Wu said.
Require longer-than-normal observation periods after the shot.
Recommendations had changed in 2011, when the CDC suggested people with egg allergies should receive one particular type of the vaccine from someone (like an allergist) who was familiar with how egg allergies can look. "There are no shortages of vaccines available", she said.
"That doesn't rule out that somebody might react to the influenza vaccine", Greenhawt said.
Anaphylaxis - a potentially life-threatening allergic reaction - "can occur rarely after the administration of any vaccine to any patient at a rate of approximately 1 per million", according to research conducted by Dr. John Kelso, an allergist and immunologist at Scripps Health, who co-authored the new guidelines.
The health district likely won't hear about someone missing work or school for a week because of the flu virus, Patterson said.
Dr Atherton said: "We know that children are super-spreaders of germs".