In comparison to other recent seasons, the 2012–2013 flu season was moderately severe, with a high percentage of outpatient visits for influenza-like illness (ILI), high rates of hospitalization (particularly among people 65 years and older), and more reported deaths attributed to pneumonia and influenza compared with recent years. This season had a somewhat early increase in flu activity through November and December, with a peak in late December. Influenza-like-illness rose quickly to well above the baseline of expected activity and remained elevated for 15 consecutive weeks, making this season slightly longer than average.
Vaccination For the 2012–2013 flu season, overall U.S. vaccination coverage was around 45% of people 6 months and older, with higher rates in children (around 57%) than adults (about 41.5%), showing slight increases from the prior year, though rates varied by state and demographic, with children aged 6–23 months having the highest uptake. https://www.cidrap.umn.edu/influenza-vaccines/us-data-show-higher-flu-vaccine-uptake-kids-adults-health-workers
See also
United States influenza statistics by flu season
References
External links the CDC's frequently asked questions about the 2012-2013 flu season