Two people in their 80s died last week and a third died earlier in February.
This season's toll is the highest since the 2009-2010 season, when 58 people died.
The season generally runs through fall and winter but health officials say Wednesday that it may have peaked.
Officials say more people were treated for flu-like symptoms at emergency rooms in the third week of February. However, the number of flu cases confirmed by lab tests fell for the fourth week in a row.
About 4,500 cases have been confirmed.