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More information on these estimates is available on CDC’s Disease Burden of Influenza page.During the 2018-2019 flu season, CDC began reporting cumulative, in-season estimates of the disease burden of influenza, including estimates of the total number of flu illnesses in the United States.

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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.

There is no preferential recommendation for one injectable flu vaccine over another.

CDC monitors certain key flu indicators (for example, outpatient visits of influenza-like illness (ILI), the results of laboratory testing and reports of flu hospitalizations and deaths).

When these indicators rise and remain elevated for a number of consecutive weeks, “flu season” is said to have begun.

It is not possible to predict what this flu season will be like.

While flu spreads every year, the timing, severity, and length of the season varies from one season to another.

There are several reasons for this including that ILINet does not include every health care provider and monitors flu-like illness, not laboratory-confirmed influenza cases.

Also, flu illness is not a reportable disease and not everyone who gets sick with flu seeks medical care or gets tested.

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.

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.

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