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For 2018-2019, trivalent (three-component) vaccines are recommended to contain: You should get a flu vaccine before flu begins spreading in your community.
When these indicators rise and remain elevated for a number of consecutive weeks, “flu season” is said to have begun.CDC recommends that people get a flu vaccine by the end of October.Getting vaccinated later, however, can still be beneficial and vaccination should continue to be offered throughout flu season, even into January or later.CDC conducts surveillance for flu-related hospitalizations through the Influenza Hospitalization Surveillance Network (Flu Surv-NET), a collaboration between CDC, the Emerging Infections Program, and additional Influenza Hospitalization Surveillance Project (IHSP) states in 13 geographically distributed areas in the United States. The data collected through Flu Surv-NET allows CDC to calculate an overall hospitalization rate, as well as by age group, but this system does not provide the total number of flu hospitalizations that actually occur in the United States.The network includes hospitals that serve roughly 9 percent of the U. Reported Flu Surv-NET hospitalization rates are adjusted to correct for under-detection, which is calculated from the percent of persons hospitalized with respiratory illness who were tested for influenza and the average sensitivity of influenza tests used in the participating Flu Surv-NET surveillance hospitals.