The 2019-20 season is described as having moderate severity however, the effect of flu differed by age group and the severity of the season in some age groups was higher. Activity began to decline in March, perhaps associated with community prevention measures for COVID-19 ( 5-6). Overall, influenza A(H1N1)pdm09 viruses were the most commonly reported influenza viruses this season. The season was characterized by two consecutive waves of activity, beginning with influenza B viruses and followed by A(H1N1)pdm09 viruses. Background and Results: 2019–2020 Burden Estimatesįlu activity in the United States during the 2019–2020 season began to increase in November and was consistently high through January and February. More information on How CDC Estimates Flu Burden is available, as well as answers to frequently asked questions about CDC’s flu burden estimates. The 19 season estimates are now considered final, however the 2019-2020 burden estimates are still preliminary and may change as more information becomes available. The estimates for the 2019-2020 season pull information from all past seasons including the 19 seasons and because our methods use the most conservative estimates of under-detection of flu, the 2019-2020 burden estimates also decreased. Because the percent of individuals who were tested for flu was high in all age groups, the adjustment for under-detection of flu was lower and our burden estimates decreased. Final testing information from the 2017-2018 seasons indicated an increase in testing for flu across all age groups and the FluSurv-NET sites. Since then, complete information to estimate the burden of the 19 flu seasons has become available. Because current testing data was not available at the time of estimation (it takes approximately two years to finalize information on flu testing practices), the estimates that were previously published on the CDC website were made using testing information from prior flu seasons. More Why did the estimates for the 2017-2018, 2018-2019, and 2019-2020 decrease compared with previous estimates for these seasons?ĬDC’s model used to estimate the burden of flu includes information collected about flu testing practices. Conversely, in only 5 times out of a 100 would the uncertainty interval not contain the true point estimate. A 95% uncertainty interval means that if the study were repeated 100 times, then 95 out of 100 times the uncertainty interval would contain the true point estimate.
The uncertainty interval provides a range in which the true number or rate of flu illnesses, medical visits, hospitalizations, or deaths would be expected to fall if the same study was repeated many times, and it gives an idea of the precision of the point estimate. † Uncertainty interval: Adjusted estimates are presented in two parts: an uncertainty interval and a point estimate. These estimates will change as those data become available and the estimates are updated. *Some of the data used to calculate burden estimates are incomplete or not yet available. Table 2: Estimated rates of flu-related disease outcomes, per 100,000, by age group - United States, 2019-2020 flu season
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