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Usually ILI increases first, followed by an increase in flu-associated hospitalizations, which is then followed by increases in flu-associated deaths. The timing of flu is unpredictable and can vary in different parts of the country and from season to season.For the most current influenza surveillance information: Weekly U. Seasonal flu viruses can be detected year-round; however, seasonal flu activity often begins as early as October and November and can continue to occur as late as May.There is a table showing all flu vaccines that are FDA-approved for use in the United States during the 2018-2019 season. flu vaccines is reviewed annually and updated as needed to match circulating flu viruses.There are many different flu viruses and they are constantly changing. Flu vaccines protect against the three or four viruses (depending on vaccine) that research suggests will be most common.For 2018-2019, trivalent (three-component) vaccines are recommended to contain: You should get a flu vaccine before flu begins spreading in your community.
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.
This system allows CDC to track levels of medically attended flu-like illness over the course of the flu season.
CDC does not know exactly how many people get sick with seasonal flu each year.
Children who need two doses of vaccine to be protected should start the vaccination process sooner, because the two doses must be given at least four weeks apart.
The recommendations for people with egg allergies are the same as last season.
While the use of cell-grown reference viruses and cell-based technology may offer the potential for better protection over traditional, egg-based flu vaccines because they result in vaccine viruses that are more similar to flu viruses in circulation, there are no data yet to support this.