The most recent victims were between the ages of 80 to 99, and all three had multiple underlying health conditions.
"This is just not typical, we're seeing the flu season lasting a little longer than it normally does, here we are at the beginning of April, we had one more death and the number of hospitalizations is much higher this year, so we've looked at a much more severe season overall", Mendoza told WXXI News.
"It has been estimated that in South Africa some 50% of flu-related deaths occur in the elderly and approximately 30% in people with HIV/Aids".
DE officials say that there have been three more flu-related deaths within the past month including one in Sussex County.More news: April Ryan Asks White House If Trump Has Considered Resigning from Office
Flu season typically lasts until early May.
Although he couldn't specify how many patients presented definite flu symptoms, Dr Khan said a number of calls were made to Dial A Home Doctor where he detected possible flu symptoms.
At this point, it appears the local flu season has peaked and now is waning, said Dr. Amy Person, health officer of the Benton-Franklin Health District.
But the vaccine can still prevent many flu cases, according to Heath, who cites data from the federal Centers for Disease Control. However, it also said that in DE the virus was spreading in a wide geographic area. The number of adult deaths related to influenza won't be available until later this year.More news: Laura Ingraham came back to Fox News, hurt but fighting
At this time, OR is one of 13 states with low flu activity.
The 20 people who died of flu in the Tri-Cities this season all were at higher risk due to their age or underlying health issues. Flu activity is still high in northwest and east central New Jersey.
The World Health Organisation has included the deadly virus in the latest flu vaccine. And right now "about 90% or more is influenza B".
Fredel and Nate Wardle, press secretary for the Pennsylvania Department of Health, didn't see much point in getting the shot now, but Tina Tan, state epidemiologist for the New Jersey Department of Health, said it is "absolutely not" too late to get vaccinated.More news: Statewide tornado drill created to get you prepared for severe weather