[Behavior of influenza seasons in Mexico from 2010 to 2016: Analysis and prospective]

The influenza virus spreads rapidly through recurring seasonal outbreaks during the fall and winter. Our country has the Epidemiological Surveillance System for Influenza (SISVEFLU), in operation since 2006, which has records of 558 health units of Influenza. According to the information recorded in it, we can see that the 2010-2016 influenza seasons have a biannual behavior, and that in the 2010-2011, 2012-2013, and 2014-2015 seasons, the predominant viral subtype was A (H3N2), while in the 2011-2012, 2013-2014, and 2015-2016 seasons, the predominant subtype was A (H1N1) pdm09, which was associated with an increased number of influenza cases and deaths. It is expected that the 2016-2017 season will have predominance of subtype A (H3N2) and in 2017-2018 the expected will be subtype A (H1N1) pmd09. During the 2010-2016 seasons, 53.5% of cases of influenza were women; 77% had no history of vaccination, and 36% had one or more comorbidities. As for deaths, 55% was observed in males, 85% had not been vaccinated, and 71.5% had one or more comorbidities.