Canadian journal of public health = Revue canadienne de sante publique · 2021
Changes in the incidence of seasonal influenza in response to COVID-19 social distancing measures: an observational study based on Canada's national influenza surveillance system.
СтатьяНаблюдательное исследованиеНазвание и аннотация: Перевод пока не подготовлен
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Pierce Andrew, Haworth-Brockman Margaret, Marin Diana, Rueda Zulma V, Keynan Yoav
Аннотация
OBJECTIVES: Seasonal influenza is an acute respiratory infection that presents a significant annual burden to Canadians and the Canadian healthcare system. Social distancing measures that were implemented to control the 2019-2020 novel coronavirus outbreak were investigated for their ability to lessen the incident cases of seasonal influenza.
METHODS: We conducted an ecological study using data from Canada's national influenza surveillance system to investigate whether social distancing measures to control COVID-19 reduced the incident cases of seasonal influenza. Data taken from three separate time frames facilitated analysis of the 2019-2020 influenza season prior to, during, and following the implementation of COVID-19-related measures and enabled comparisons with the same time periods during three preceding flu seasons. The incidence, which referred to the number of laboratory-confirmed cases of specific influenza strains, was of primary focus. Further analysis determined the number of new laboratory-confirmed influenza or influenza-like illness outbreaks.
RESULTS: Our results indicate a premature end to the 2019-2020 influenza season, with significantly fewer cases and outbreaks being recorded following the enactment of many COVID-19 social distancing policies. The incidence of influenza strains A (H3N2), A (unsubtyped), and B were all significantly lower at the tail end of the 2019-2020 influenza season as compared with preceding seasons (p = 0.0003, p = 0.0007, p = 0.0019).
CONCLUSION: Specific social distancing measures and behaviours may serve as effective tools to limit the spread of influenza transmission moving forward, as they become more familiar.
METHODS: We conducted an ecological study using data from Canada's national influenza surveillance system to investigate whether social distancing measures to control COVID-19 reduced the incident cases of seasonal influenza. Data taken from three separate time frames facilitated analysis of the 2019-2020 influenza season prior to, during, and following the implementation of COVID-19-related measures and enabled comparisons with the same time periods during three preceding flu seasons. The incidence, which referred to the number of laboratory-confirmed cases of specific influenza strains, was of primary focus. Further analysis determined the number of new laboratory-confirmed influenza or influenza-like illness outbreaks.
RESULTS: Our results indicate a premature end to the 2019-2020 influenza season, with significantly fewer cases and outbreaks being recorded following the enactment of many COVID-19 social distancing policies. The incidence of influenza strains A (H3N2), A (unsubtyped), and B were all significantly lower at the tail end of the 2019-2020 influenza season as compared with preceding seasons (p = 0.0003, p = 0.0007, p = 0.0019).
CONCLUSION: Specific social distancing measures and behaviours may serve as effective tools to limit the spread of influenza transmission moving forward, as they become more familiar.