Decreased Incidence of Influenza During the COVID-19 Pandemic

Wang, Yiping; Shen, Can; Luo, Jianping; Yu, Wanjun

doi:10.2147/ijgm.s343940

Cited by 10 publications

(9 citation statements)

References 23 publications

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“…We observed a decrease in the incidence of PCR-confirmed influenza infections coincident with the beginning of the COVID-19 pandemic in Mexico ( Figure 1 ). This decreasing trend was previously documented in our country and other territories [ 8 , 9 , 10 ]. The first COVID-19 case in Mexico had been registered by the end of February 2020 [ 11 ].…”

Section: Discussionsupporting

confidence: 86%

Reemerging Influenza Virus Infections during the Dominance of the Omicron SARS-CoV-2 Variant in Mexico

et al. 2022

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The burden of influenza in Mexico has been high. We aimed to characterize its epidemiological patterns before and during the coronavirus disease 2019 (COVID-19) pandemic. A retrospective cohort study was conducted and 5652 PCR-confirmed cases of influenza (October 2019–April 2022) were analyzed. The highest incidence (144 per million) was observed in December 2019 and rapidly decreased right before the start of the pandemic (February 2020). No cases were documented in the 2020–2021 season, and infections reemerged at a low level (8 per million) in December 2021. The case-fatality rates were around 5% in both seasons ( = 0.591). The dominant strains were AH1N1 and AH3N2 in the 2019–2020 and 2021–2022 seasons, respectively. In multiple analysis, males and older patients were at increased risk of a fatal outcome. Flu vaccination and infection by B lineages (vs. AH1N1) showed a protective effect. Our results suggest that the spread of the influenza virus reemerged in the 2021–2022 season when the SARS-CoV-2 Omicron variant (B.1.1.529) was dominant. Efforts focusing on the prevention of transmission of respiratory viral pathogens, together with flu vaccination, may be useful to reduce the risk of an influenza outbreak.

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Section: Discussionsupporting

confidence: 86%

Reemerging Influenza Virus Infections during the Dominance of the Omicron SARS-CoV-2 Variant in Mexico

et al. 2022

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“…The results of this study are largely consistent with other national surveys into the prevalence of respiratory pathogens pre‐, during and post‐COVID‐19. The implementation of control measures for SARS‐CoV‐2, a respiratory pathogen, had a significant impact on the spread of other respiratory pathogens 12 . However, the rebound effect of this is a reduction in herd immunity to these pathogens once the restrictions were relaxed 17 …”

Section: Discussionmentioning

confidence: 99%

Time trend of respiratory viruses before and during the COVID‐19 pandemic in severe acute respiratory virus infection in the Sultanate of Oman between 2017 and 2022

Al Kindi,

Meredith,

Al‐Jardani

et al. 2023

Influenza Resp Viruses

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IntroductionSevere acute respiratory illness (SARI) is a potentially lethal condition, necessitating thorough medical care. COVID‐19 underscored the SARI threat, but other high‐risk pathogens require monitoring alongside SARS‐CoV‐2. Oman instituted a comprehensive testing system to gauge the prevalence of these pathogens between 2017 and 2021, aiding resource allocation and public health responses to potential respiratory pathogen outbreaks.MethodsSamples from SARI cases admitted to ICU were tested for pathogens using the Fast‐Track Diagnostic (FTD) molecular assay, a respiratory virus panel (RVP) that tests for 21 pathogens, including 20 viruses, by qPCR.ResultsBetween 2017 and 2022, ~30 000 samples were analysed using the RVP panel. Among SARI patients, 8%–42% tested positive for respiratory pathogens, with 4% showing multiple infectious agents, especially in children under 10. A drop in positivity during 2020–2021 can be attributed to SARS‐CoV‐2 control measures, followed by a rebound in infections in early 2022.DiscussionThe COVID‐19 pandemic heightened awareness of respiratory pathogens' spread without adequate control measures. Influenza A/B, human rhinoviruses and respiratory syncytial virus constituted over 50% of severe acute respiratory illness cases in Oman over the past 5 years. During the pandemic, the incidence of these infections significantly declined, demonstrating the efficacy of COVID‐19 prevention measures in reducing spread of other pathogens.

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“…Существуют данные о том, что на конец 2020 г. половина случаев COVID-19 в г. Ухань была обусловлена сочетанным инфицированием вирусом гриппа [22]. Предполагается, что циркуляция вируса гриппа в течение недель, предшествовавших вспышке в Западной Европе, могла «скрыть» начало распространения SARS-CoV-2 внутри сообщества [19].…”

Section: оценка синергического взаимодействия вируса гриппа и Sars-cov-2unclassified

“…A ratio between influenza A/B RT-PCR assays and positive samples in the years 2017/2018-2020/2021 in China (city of Ningbo)[22] …”

mentioning

confidence: 99%

Epidemiology and course of infectious diseases during the covid-19 pandemic. Report 2. Interference engaged between SARS-COV-2 and acute respiratory viral infections

Боева

Belyakov

Simakina

et al. 2022

Russian Journal of Infection and Immunity

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The analytical review, based on the analysis of literature and own materials, outlines the features of the interaction of a new coronavirus infection (COVID-19) and acute respiratory diseases. Particular attention is paid to the combined course of SARS-CoV-2 and the influenza virus, a comparative characteristic of the severity of the clinical picture. An assessment of the epidemic situation against the background of the COVID-19 pandemic in foreign countries and the Russian Federation made it possible to establish the presence of the phenomenon of SARS-CoV-2 interference with other viral respiratory agents, based on the facts of a sharp suppression of the circulation of influenza viruses, respiratory syncytial virus (RSV) and other pathogens of acute respiratory viral infections (ARVI) during the period of active spread of pandemic coronavirus. The results obtained confirm the need to ensure effective surveillance and additional diagnostic capabilities for monitoring SARS, which can significantly affect the decision-making on appropriate preventive measures and clinical management of relevant diseases.

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Decreased Incidence of Influenza During the COVID-19 Pandemic

Cited by 10 publications

References 23 publications

Reemerging Influenza Virus Infections during the Dominance of the Omicron SARS-CoV-2 Variant in Mexico

Reemerging Influenza Virus Infections during the Dominance of the Omicron SARS-CoV-2 Variant in Mexico

Time trend of respiratory viruses before and during the COVID‐19 pandemic in severe acute respiratory virus infection in the Sultanate of Oman between 2017 and 2022

Epidemiology and course of infectious diseases during the covid-19 pandemic. Report 2. Interference engaged between SARS-COV-2 and acute respiratory viral infections

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