But experts also are monitoring an increase in illnesses from a kind of flu virus that tends to cause more hospitalizations and deaths, especially in the elderly.
There have already been more than 26 million cases of the flu in the US since October 1, with more than 12.4 million flu-related medical visits and up to 31,200 deaths caused by the virus.
Rates of hospitalization for influenza and pneumonia climbed above the established national threshold for the sixth time this season during week 8, and the proportion to all visits of people seeing a health care provider for influenza-like illness - some 4.7 percent - decreased slightly but remained above the national baseline of 2.2 percent at the end of week nine.
The flu was reported to be widespread in IN and 47 other states last week.
A second wave of the flu - with a new, stronger strain - is already prevalent in the southeast, according to Healthline.
Flu season will apparently continue well into April and even May in the United States this year as the virus remains widespread, according to the Centers for Disease Control and Prevention's (CDC) weekly report.
So far, an estimated 26 million cases have been reported, resulting in almost 350,00 hospitalizations and more than 30,000 deaths. All of them were people over the age of 50.
But what's concerning is that more and more cases are involving a unsafe strain of the virus.
Last season, an estimated 80,000 Americans died of flu and its complications, the disease's highest death toll in at least four decades. But for the past two weeks, more illnesses have been tied to a more severe strain, H3N2, the CDC reports.
"Although it's not flawless, it still prevents many, many infections, and even if you should get influenza despite having received the vaccine, it tends to make a less severe infection". Two deaths were associated with an influenza A virus for which no subtyping was performed and occurred during weeks six and nine - the weeks ending February 9 and March 2.