Cumulative total for the season, as of


The flu season runs from October into May. It isn’t clear why flu is seasonal. It is probably a combination of cold weather forcing people into close proximity indoors and cold dry air which seems to make transmission of the virus easier and also to prevent humans from fighting off the flu.

The youngest Mainer with a confirmed case of the flu is 4 months old and the oldest is 100. There have been 99 hospitalizations associated with flu this season.

Hover over the map for detailed county-by-county statistics, or compare week-by-week numbers by hovering over each week’s bar in the bar chart.

This interactive was updated on December 28, 2017 to include the most recent data from the previous week.