Estimating the burden of seasonal influenza in Spain from surveillance of mild and severe influenza disease, 2010‐2016

Oliva, Josep M.; Delgado-Sanz, Concha; Larrauri, Amparo

doi:10.1111/irv.12499

Cited by 51 publications

(60 citation statements)

References 29 publications

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“…We found on average 48 hospitalizations per 100 000 population during an influenza season, which is within the range found in other countries, but among the higher country‐specific rates . The increase in hospitalizations in the elderly could be a result of improved diagnostics in this group.…”

Section: Discussionsupporting

confidence: 78%

“…On average, 1.7% of the population was diagnosed with influenza in primary care each influenza season, which is within the range of findings from other countries . In Norway, the public healthcare system offers primary and emergency outpatient care at low or no cost and hospital care is free for all citizens.…”

Section: Discussionsupporting

confidence: 62%

“…Our results show that influenza outbreaks cause a substantial dis- On average, 1.7% of the population was diagnosed with influenza in primary care each influenza season, which is within the range of findings from other countries. 12,25,26 In Norway, the public health- diagnosed with influenza due to lack of testing, or they could be given another, more generic symptom-based ICPC-code like "cough" or "respiratory infection. "…”

Section: Discussionmentioning

confidence: 99%

“…A UK study found that 18% of the unvaccinated population was infected each season . Studies from several countries support that hospitalizations and complications of influenza are substantial . For children under 5 years of age, it has been estimated that influenza contributes to around 870 000 hospitalizations each year globally .…”

Section: Introductionmentioning

confidence: 99%

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Burden of medically attended influenza in Norway 2008‐2017

Hauge

Bakken

Blasio

et al. 2019

Influenza Resp Viruses

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Background The burden of influenza in Norway remains uncertain, and data on seasonal variations and differences by age groups are needed. Objective To describe number of patients diagnosed with influenza in Norway each season and the number treated in primary or specialist health care by age. Further, to compare the burden of seasonal influenza with the 2009‐2010 pandemic outbreak. Methods We used Norwegian national health registries and identified all patients diagnosed with influenza from 2008 to 2017. We calculated seasonal rates, compared hospitalized patients with patients in primary care and compared seasonal influenza with the 2009‐2010 pandemic outbreak. Results Each season, on average 1.7% of the population were diagnosed with influenza in primary care, the average rate of hospitalization was 48 per 100 000 population while the average number of hospitalized patients each season was nearly 2500. The number of hospitalized influenza patients ranged from 579 in 2008‐2009 to 4973 in 2016‐2017. Rates in primary care were highest among young adults while hospitalization rates were highest in patients 80 years and older and in children below 5 years. The majority of in‐hospital deaths were in patients 70 years and older. Fewer patients were hospitalized during the 2009‐2010 pandemic than in seasonal outbreaks, but during the pandemic, more people in the younger age groups were hospitalized and fatal cases were younger. Conclusion Influenza causes a substantial burden in primary care and hospitals. In non‐pandemic seasons, people above 80 years have the highest risk of influenza hospitalization and death.

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Section: Discussionsupporting

confidence: 78%

Section: Discussionsupporting

confidence: 62%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Burden of medically attended influenza in Norway 2008‐2017

Hauge

Bakken

Blasio

et al. 2019

Influenza Resp Viruses

View full text Add to dashboard Cite

show abstract

“…There is a widespread consensus that influenza imposes a considerable burden on public health, including substantial numbers of severely ill patients resulting in hospitalisations and deaths . The impact of influenza on public health varies across seasons, mainly due to the varying influenza virus types/subtypes, vaccine uptake in the community and the match between the recommended vaccine with the circulating viruses .…”

Section: Introductionmentioning

confidence: 99%

Estimates of influenza‐associated hospitalisations in tropical Singapore, 2010‐2017: Higher burden estimated in more recent years

Chua

et al. 2019

Influenza Resp Viruses

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Background We previously estimated Singapore's influenza‐associated hospitalisation rate for pneumonia and influenza (P&I) in 2010‐2012 to be 29.6 per 100 000 person‐years, which corresponds to 11.2% of all P&I hospitalisations. Objectives This study aims to update Singapore's estimates of the influenza‐associated pneumonia and influenza (P&I) hospitalisation burden using the latest data from 2010 to 2017. Methods We estimated the number of P&I hospitalisations associated with influenza using generalised additive models. We specified the weekly number of admissions for P&I and the weekly influenza positivity in the models, along with potential confounders such as weekly respiratory syncytial virus (RSV) positivity and meteorological data. Results In 2010‐2017, 16.3% of all P&I hospitalisations in Singapore were estimated to be attributed to influenza, corresponding to an excess influenza‐associated P&I hospitalisation rate of 50.1 per 100 000 person‐years. Higher excess rates were estimated for children aged 0‐4 years (186.8 per 100 000 person‐years) and elderly aged ≥ 65 years (338.0 per 100 000 person‐years). Higher influenza‐associated hospitalisation rates were estimated for 2016 and 2017 (67.9 and 75.1 per 100 000 persons, respectively) years when the influenza A(H3N2) subtype was dominant. Conclusion Influenza burden in Singapore has increased since 2010. Influenza vaccination programmes should continue to be prioritised for the young and the elderly.

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Estimation of influenza-attributable burden in primary care from season 2014/2015 to 2018/2019, France

Paternoster

Masse

Werf

et al. 2021

Eur J Clin Microbiol Infect Dis

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Influenza viruses cause seasonal epidemics whose intensity varies according to the circulating virus type and subtype. We aim to estimate influenza-like illness (ILI) incidence attributable to influenza viruses in France from October 2014 to May 2019. MethodsPhysicians participating in the French Sentinelles network reported the number of patients with ILI seen in consultation and performed nasopharyngeal swabs in a sample of these patients. The swabs were tested by RT-PCR for the presence of influenza viruses. These clinical and virological data were combined to estimate ILI incidence attributable to influenza viruses by subtypes and age groups. ResultsInfluenza incidence rates over seasons ranged from 1.9% (95% CI, 1.9; 2.0) to 3.4% (95% CI, 3.2; 3.6) of the population. Each season, more than half of ILI cases were attributable to influenza. Children under 15 years were the most affected, with influenza incidence rates ranging from 3.0% (95% CI, 2.8;3.3) to 5.7% (95% CI, 5.3;6.1). Co-circulation of several (sub)types of influenza viruses was observed each year, except in 2016/17 where A(H3N2) viruses accounted for 98.0% of the influenza cases. Weekly ILI incidences attributable to each influenza virus (sub)type were mostly synchronized with ILI incidence, except in 2014/15 and 2017/18, where incidence attributable to type B viruses peaked few weeks later. ConclusionThe burden of medically-attended influenza among patients with ILI is significant in France, varying considerably across years and age groups. These results show the importance of influenza surveillance in primary care combining clinical and virological data.

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Estimating the burden of seasonal influenza in Spain from surveillance of mild and severe influenza disease, 2010‐2016

Cited by 51 publications

References 29 publications

Burden of medically attended influenza in Norway 2008‐2017

Burden of medically attended influenza in Norway 2008‐2017

Estimates of influenza‐associated hospitalisations in tropical Singapore, 2010‐2017: Higher burden estimated in more recent years

Estimation of influenza-attributable burden in primary care from season 2014/2015 to 2018/2019, France

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