Impact of influenza vaccination programmes among the elderly population on primary care, Portugal, Spain and the Netherlands

2015/16 to 2017/18 influenza seasons

Ausenda Machado, Clara Mazagatos, Frederika Dijkstra, Irina Kislaya, Alin Gherasim, Scott A. McDonald, Esther Kissling, Marta Valenciano, Adam Meijer, Mariëtte Hooiveld, Baltazar Nunes, Amparo Larrauri

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Abstract

BackgroundTo increase the acceptability of influenza vaccine, it is important to quantify the overall benefits of the vaccination programme.AimTo assess the impact of influenza vaccination in Portugal, Spain and the Netherlands, we estimated the number of medically attended influenza-confirmed cases (MAICC) in primary care averted in the seasons 2015/16 to 2017/18 among those ≥ 65 years.MethodsWe used an ecological approach to estimate vaccination impact. We compared the number of observed MAICC (n) to the estimated number that would have occurred without the vaccination programme (N). To estimate N, we used: (i) MAICC estimated from influenza surveillance systems, (ii) vaccine coverage, (iii) pooled (sub)type-specific influenza vaccine effectiveness estimates for seasons 2015/16 to 2017/18, weighted by the proportion of virus circulation in each season and country. We estimated the number of MAICC averted (NAE) and the prevented fraction (PF) by the vaccination programme.ResultsThe annual average of NAE in the population ≥ 65 years was 33, 58 and 204 MAICC per 100,000 in Portugal, Spain and the Netherlands, respectively. On average, influenza vaccination prevented 10.7%, 10.9% and 14.2% of potential influenza MAICC each season in these countries. The lowest PF was in 2016/17 (4.9-6.1%) with an NAE ranging from 24 to 69 per 100,000.ConclusionsOur results suggest that influenza vaccination programmes reduced a substantial number of MAICC. Together with studies on hospitalisations and deaths averted by influenza vaccination programmes, this will contribute to the evaluation of the impact of vaccination strategies and strengthen public health communication.

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Portugal
Netherlands
Spain
Human Influenza
Primary Health Care
Vaccination
Population
Influenza Vaccines
Health Communication
Hospitalization
Vaccines
Public Health

Keywords

  • averted cases
  • impact
  • influenza
  • influenza vaccine

Cite this

@article{1986617c611b46589ddab2ac232e641e,
title = "Impact of influenza vaccination programmes among the elderly population on primary care, Portugal, Spain and the Netherlands: 2015/16 to 2017/18 influenza seasons",
abstract = "BackgroundTo increase the acceptability of influenza vaccine, it is important to quantify the overall benefits of the vaccination programme.AimTo assess the impact of influenza vaccination in Portugal, Spain and the Netherlands, we estimated the number of medically attended influenza-confirmed cases (MAICC) in primary care averted in the seasons 2015/16 to 2017/18 among those ≥ 65 years.MethodsWe used an ecological approach to estimate vaccination impact. We compared the number of observed MAICC (n) to the estimated number that would have occurred without the vaccination programme (N). To estimate N, we used: (i) MAICC estimated from influenza surveillance systems, (ii) vaccine coverage, (iii) pooled (sub)type-specific influenza vaccine effectiveness estimates for seasons 2015/16 to 2017/18, weighted by the proportion of virus circulation in each season and country. We estimated the number of MAICC averted (NAE) and the prevented fraction (PF) by the vaccination programme.ResultsThe annual average of NAE in the population ≥ 65 years was 33, 58 and 204 MAICC per 100,000 in Portugal, Spain and the Netherlands, respectively. On average, influenza vaccination prevented 10.7{\%}, 10.9{\%} and 14.2{\%} of potential influenza MAICC each season in these countries. The lowest PF was in 2016/17 (4.9-6.1{\%}) with an NAE ranging from 24 to 69 per 100,000.ConclusionsOur results suggest that influenza vaccination programmes reduced a substantial number of MAICC. Together with studies on hospitalisations and deaths averted by influenza vaccination programmes, this will contribute to the evaluation of the impact of vaccination strategies and strengthen public health communication.",
keywords = "averted cases, impact, influenza, influenza vaccine",
author = "Ausenda Machado and Clara Mazagatos and Frederika Dijkstra and Irina Kislaya and Alin Gherasim and McDonald, {Scott A.} and Esther Kissling and Marta Valenciano and Adam Meijer and Mari{\"e}tte Hooiveld and Baltazar Nunes and Amparo Larrauri",
year = "2019",
month = "11",
day = "1",
doi = "10.2807/1560-7917.ES.2019.24.45.1900268",
language = "English",
volume = "24",
journal = "Eurosurveillance",
issn = "1560-7917",
publisher = "European Centre for Disease Prevention and Control",
number = "45",

}

Impact of influenza vaccination programmes among the elderly population on primary care, Portugal, Spain and the Netherlands : 2015/16 to 2017/18 influenza seasons. / Machado, Ausenda; Mazagatos, Clara; Dijkstra, Frederika; Kislaya, Irina; Gherasim, Alin; McDonald, Scott A.; Kissling, Esther; Valenciano, Marta; Meijer, Adam; Hooiveld, Mariëtte; Nunes, Baltazar; Larrauri, Amparo.

In: Euro surveillance : bulletin Europeen sur les maladies transmissibles = European communicable disease bulletin, Vol. 24, No. 45, 01.11.2019.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Impact of influenza vaccination programmes among the elderly population on primary care, Portugal, Spain and the Netherlands

T2 - 2015/16 to 2017/18 influenza seasons

AU - Machado, Ausenda

AU - Mazagatos, Clara

AU - Dijkstra, Frederika

AU - Kislaya, Irina

AU - Gherasim, Alin

AU - McDonald, Scott A.

AU - Kissling, Esther

AU - Valenciano, Marta

AU - Meijer, Adam

AU - Hooiveld, Mariëtte

AU - Nunes, Baltazar

AU - Larrauri, Amparo

PY - 2019/11/1

Y1 - 2019/11/1

N2 - BackgroundTo increase the acceptability of influenza vaccine, it is important to quantify the overall benefits of the vaccination programme.AimTo assess the impact of influenza vaccination in Portugal, Spain and the Netherlands, we estimated the number of medically attended influenza-confirmed cases (MAICC) in primary care averted in the seasons 2015/16 to 2017/18 among those ≥ 65 years.MethodsWe used an ecological approach to estimate vaccination impact. We compared the number of observed MAICC (n) to the estimated number that would have occurred without the vaccination programme (N). To estimate N, we used: (i) MAICC estimated from influenza surveillance systems, (ii) vaccine coverage, (iii) pooled (sub)type-specific influenza vaccine effectiveness estimates for seasons 2015/16 to 2017/18, weighted by the proportion of virus circulation in each season and country. We estimated the number of MAICC averted (NAE) and the prevented fraction (PF) by the vaccination programme.ResultsThe annual average of NAE in the population ≥ 65 years was 33, 58 and 204 MAICC per 100,000 in Portugal, Spain and the Netherlands, respectively. On average, influenza vaccination prevented 10.7%, 10.9% and 14.2% of potential influenza MAICC each season in these countries. The lowest PF was in 2016/17 (4.9-6.1%) with an NAE ranging from 24 to 69 per 100,000.ConclusionsOur results suggest that influenza vaccination programmes reduced a substantial number of MAICC. Together with studies on hospitalisations and deaths averted by influenza vaccination programmes, this will contribute to the evaluation of the impact of vaccination strategies and strengthen public health communication.

AB - BackgroundTo increase the acceptability of influenza vaccine, it is important to quantify the overall benefits of the vaccination programme.AimTo assess the impact of influenza vaccination in Portugal, Spain and the Netherlands, we estimated the number of medically attended influenza-confirmed cases (MAICC) in primary care averted in the seasons 2015/16 to 2017/18 among those ≥ 65 years.MethodsWe used an ecological approach to estimate vaccination impact. We compared the number of observed MAICC (n) to the estimated number that would have occurred without the vaccination programme (N). To estimate N, we used: (i) MAICC estimated from influenza surveillance systems, (ii) vaccine coverage, (iii) pooled (sub)type-specific influenza vaccine effectiveness estimates for seasons 2015/16 to 2017/18, weighted by the proportion of virus circulation in each season and country. We estimated the number of MAICC averted (NAE) and the prevented fraction (PF) by the vaccination programme.ResultsThe annual average of NAE in the population ≥ 65 years was 33, 58 and 204 MAICC per 100,000 in Portugal, Spain and the Netherlands, respectively. On average, influenza vaccination prevented 10.7%, 10.9% and 14.2% of potential influenza MAICC each season in these countries. The lowest PF was in 2016/17 (4.9-6.1%) with an NAE ranging from 24 to 69 per 100,000.ConclusionsOur results suggest that influenza vaccination programmes reduced a substantial number of MAICC. Together with studies on hospitalisations and deaths averted by influenza vaccination programmes, this will contribute to the evaluation of the impact of vaccination strategies and strengthen public health communication.

KW - averted cases

KW - impact

KW - influenza

KW - influenza vaccine

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U2 - 10.2807/1560-7917.ES.2019.24.45.1900268

DO - 10.2807/1560-7917.ES.2019.24.45.1900268

M3 - Article

VL - 24

JO - Eurosurveillance

JF - Eurosurveillance

SN - 1560-7917

IS - 45

ER -