Overall Activity Trends: The number of visits and hospitalizations remained stable among adults and rose slightly among children (+6% in visits, or +5,092 visits; +4% in hospitalizations, or +372 hospitalizations) and among those aged 75 and older (+6% in visits, or +2,694 visits; +4% in hospitalizations, or +996 hospitalizations). The numbers across all age groups are higher than those observed in 2013 and 2014 during the same period.

Trends in the most common conditions: Among children under 15, visits for influenza/flu-like illness and isolated fever have increased significantly. Visits for bronchiolitis remain stable among children under 2 but still represent the third most common reason for emergency department visits in this age group. The main conditions are stable or declining among adults aged 15 to 74. Among those over 75, the most frequently seen conditions in emergency departments are trauma, fainting spells, and pneumonia (+12%, or +294 visits).

Trends in Seasonal IndicatorsWith 4,812 visits over the past week, visits to emergency departments for influenza/flu-like illness are up 58% among children under 15 (i.e., +984 visits), 57% among those aged 15–74 (i.e., +712 visits), and 116% among those over 75 (+96 visits). The numbers follow the trend of the 2012–2013 epidemic, with figures exceeding those of 2013 and significantly higher than those of 2014. Visits for influenza/flu-like illness are rising sharply in all regions, particularly in the West and Southeast. Hospitalizations are also on the rise (+86%, or +176 hospitalizations across all age groups), particularly among those over 75, who account for one-third of influenza-related hospitalizations (+148%, or +62 hospitalizations). The indicator for isolated fever is also rising across all age groups (+17%, or +627 visits). Case numbers are comparable to the 2012–2013 season and follow the same trend. Emergency department visits for acute bronchitis and pneumonia are increasing among adults, by 24% (+413 visits) and 13% (+536 visits), respectively. Visits for asthma and ENT infections are stable or declining among those under 15 and rising among adults, particularly those over 75, by 31% (+32 visits) and 37% (+25 visits), respectively. Across all age groups, the numbers for these four indicators remain higher than those of the previous two years. Emergency department visits for gastroenteritis are stable, with numbers comparable to those of 2014 and lower than those of 2013. The temporal trend compared to the two previous seasons shows a shift in the epidemic peak across all regions.