Arizona health officials say they're not sure why the state continues to lead the country in reports of flu-like illnesses.
The Department of Health Services says many people get sick from flu in Arizona every year but that flu is very unpredictable.
According to the department, unpredictable variables include when flu activity will be highest, how many cases will be reported each flu season, how severe the season will be and what strains will be most common.
The department says Arizona typically has the most cases in late January or early February, but that cases are peaking later than usual this year.
The department says Arizona typically has 1,500 cases of flu reported during the season's peak weeks but that 1,800 cases were reported in the state two weeks ago.