New Findings to Describe the Decrease of Influenza A/B In 2021
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Abstract
The end of the 2019/2020 influenza season was already registered in early summer 2020, and in the following season. There was an nearly complete absence of influenza. So far, the sometimes strict Covid-19 containment measures with contact restrictions and the obligation to wear a mask have been mentioned as reasons. The further processing of this influenza gap showed multifactorial reasons also the lack of registration of influenza cases This retrospective cohort study looks for further reaseons and from several perspectives in order to develop strategies for a representative recording of influenza cases derive.
For Evaluation the data of the German center of Disease Control (RKI) by the GrippeWeb, the RKI’s Survstat® tool and the RKI’s reporting data on the new coronavirus were used. In addition, an evaluation of billing data from the EBM (Uniform Value Scale) from 2017 to 2022 for the GOP (fee schedule item) 32006 and 32841 as well as an evaluation of data on sick leave and illness statistics from 2019 to 2021 and the consideration of inpatient and outpatient health costs based on the data requested in writing from the Federal Ministry of Health was performed.
In contrast to influenza A/B, the other viral respiratory pathogens (adenovirus, parainfluenza virus and RS virus) do not show any significant reduction. From 2020, the number of reports of respiratory infections to the RKI increased from an average of 300,000 annual reports by 2019 to 1,985,985 reports in 2020, over 5,453,017 reports in 2021 and to 29,681,158 in 2022. On the other hand cases of incapacity to work due to respiratory infections fell from 31.0% in 2019 to 15.3% in 2021. Influenza-specific diagnoses (ICD: J10.1-3) were encrypted 33,727 times in 2021, in 2020 there were still 109,846. In the outpatient sector in particular, the treatment costs are falling from 2019 to 2021.
The reduction in influenza A and B from 2020 as a result of the comprehensive Covid-19 control measures, including the obligation to wear masks, cannot be considered a major reason; rather, the aspect of underreporting of influenza cases plays a significant role. Therefore, the reporting quantity of the sentinal practices should be considered and the recording of incapacity diagnoses should be taken into account.
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