Early estimates of 2014/15 seasonal influenza vaccine effectiveness in preventing influenza-like illness in general practice using the screening method in France

Souty, Cécile; Blanchon, Thierry; Bonmarin, Isabelle; Lévy-Brühl, Daniel; Behillil, Sylvie; Enouf, Vincent; Valette, Martine; Bouscambert, Maude; Turbelin, Clément; Capai, Lisandru; Roussel, Victoire; Hanslik, Thomas; Falchi, Alessandra

doi:10.1080/21645515.2015.1046661

Cited by 19 publications

(24 citation statements)

References 24 publications

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“…Virus dominance was defined depending on the proportion of virus that was circulating each season at community level. 12 As previously reported, the impact of specific circulating subtypes on the influenza hospitalization rates was variable depending on age 5,9,13,16 and previous exposition to influenza viruses. We also observed that the proportions of ICU admission may vary depending on availability of hospital resources, which depends on the total number of influenza cases during the epidemic period.…”

Section: Influenza Hospitalization Burden and Circulating Virus Strainmentioning

confidence: 76%

“…Two types or subtypes were considered as co-dominant if the main virus accounted from 40% to 70% of all isolates and the second most common accounted for 30% or more of all isolates. 12 The dominant virus was B/Yamagata in 2012-2013 (51%), B/ Victoria in 2015-2016 (70%), A(H3N2) in 2014-2015 (52%), and 2016-2017 (98%). In 2013-2014, both subtypes A(H1N1) (50%) and A(H3N2) (42%) were co-dominant.…”

Section: Definition Of the Virus Dominancementioning

confidence: 99%

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Characteristics of hospitalizations with an influenza diagnosis, France, 2012‐2013 to 2016‐2017 influenza seasons

Pivette

Nicolay

Lauzun

et al. 2020

Influenza Resp Viruses

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Section: Influenza Hospitalization Burden and Circulating Virus Strainmentioning

confidence: 76%

Section: Definition Of the Virus Dominancementioning

confidence: 99%

Characteristics of hospitalizations with an influenza diagnosis, France, 2012‐2013 to 2016‐2017 influenza seasons

Pivette

Nicolay

Lauzun

et al. 2020

Influenza Resp Viruses

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“…In this study, the most frequently detected respiratory virus was influenza A(H3N2), even though the seasonal influenza vaccination rate was 90% among the ARI residents. In France and other European countries, the 2014/2015 and 2016/2017 influenza outbreaks were characterized by the genetic evolution of circulating A(H3N2) strains and by reports of low-to-moderate influenza vaccine effectiveness in the elderly [19,20]. Moreover, as previously described [6], the suboptimal influenza vaccination coverage of healthcare providers and the suboptimal antiviral strategies applied (less than 5%) could increase the vulnerability of NH residents to 6 BioMed Research International influenza infection.…”

Section: Discussionmentioning

confidence: 99%

Epidemiology of Respiratory Pathogens among Elderly Nursing Home Residents with Acute Respiratory Infections in Corsica, France, 2013–2017

Masse

Capai

Falchi

2017

BioMed Research International

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Background The current study aims to describe the demographical and clinical characteristics of elderly nursing home (NH) residents with acute respiratory infections (ARIs) during four winter seasons (2013/2014–2016/2017), as well as the microbiological etiology of these infections. Methods Seventeen NHs with at least one ARI resident in Corsica, France, were included. An ARI resident was defined as a resident developing a sudden onset of any constitutional symptoms in addition to any respiratory signs. Nasopharyngeal swabs from ARI residents were screened for the presence of 21 respiratory agents, including seasonal influenza viruses. Results Of the 107 ARI residents enrolled from NHs, 61 (57%) were positive for at least one of the 21 respiratory pathogens. Forty-one (38.3%) of the 107 ARI residents had influenza: 38 (92%) were positive for influenza A (100% A(H3N2)) and three (8%) for influenza B/Victoria. Axillary fever (≥38°C) was significantly more common among patients infected with influenza A(H3N2). Conclusion The circulation of seasonal respiratory viruses other than influenza A(H3N2) seems to be sporadic among elderly NH residents. Investigating the circulation of respiratory viruses in nonwinter seasons seems to be important in order to understand better the dynamic of their year-round circulation in NHs.

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“…However, VE estimated for the 2014 season was low in our study as well as in published studies from Northern Hemisphere countries, likely due to a poor match between the A(H3N2) component of both the 2014 Southern Hemisphere and 2014–2015 Northern Hemisphere vaccines and the circulating A(H3N2) viruses which predominated in many countries. 31–35 …”

Section: Discussionmentioning

confidence: 99%

Effectiveness of the 2013 and 2014 Southern Hemisphere Influenza Vaccines Against Laboratory-confirmed Influenza in Young Children Using a Test-negative Design, Bangkok, Thailand

Kittikraisak

Suntarattiwong

Ditsungnoen

et al. 2016

Pediatric Infectious Disease Journal

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Background The Thai Advisory Committee on Immunization Practices recommends annual influenza vaccination for children six months through two years of age, although older children may be vaccinated on request. We evaluated effectiveness of the 2013 and 2014 inactivated influenza vaccines to reduce medically-attended laboratory-confirmed influenza illness among Thai children aged 7–60 months. Methods From September 2013–May 2015, children with influenza-like illness (ILI) were screened with a rapid influenza diagnostic test. Enrolled children had nasal and throat swabs tested for influenza viruses using polymerase chain reaction (PCR). Cases and controls were subjects testing positive and negative, respectively, for influenza viruses by PCR. Vaccination status was ascertained from vaccination cards. Vaccine effectiveness (VE) was calculated as 100%*(1−odds ratio of vaccination among cases versus controls). Results Of 1,377 children enrolled, cases (n=490) and controls (n=887) were similar in demographic characteristics. Cases were less likely to receive influenza vaccine than controls in 2013 (6% vs. 14%; p=0.02), but not in 2014 (6% vs. 7%; p=0.57). Among cases, 126 (26%) were positive for influenza A(H1N1)pdm09 virus, 239 (49%) for influenza A(H3N2) and 124 (25%) for influenza B. One specimen was positive for both influenza A(H3N2) and B viruses. VE for full vaccination against all viruses was 64% (95% confidence interval [CI], 21%, 84%) in 2013 and 26% (95% CI, −47%, 63%) in 2014. Conclusions Influenza vaccination was low among Thai children in our study, and VE varied by year, highlighting the need for annual monitoring of VE to better understand vaccine program effectiveness.

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Early estimates of 2014/15 seasonal influenza vaccine effectiveness in preventing influenza-like illness in general practice using the screening method in France

Cited by 19 publications

References 24 publications

Characteristics of hospitalizations with an influenza diagnosis, France, 2012‐2013 to 2016‐2017 influenza seasons

Characteristics of hospitalizations with an influenza diagnosis, France, 2012‐2013 to 2016‐2017 influenza seasons

Epidemiology of Respiratory Pathogens among Elderly Nursing Home Residents with Acute Respiratory Infections in Corsica, France, 2013–2017

Effectiveness of the 2013 and 2014 Southern Hemisphere Influenza Vaccines Against Laboratory-confirmed Influenza in Young Children Using a Test-negative Design, Bangkok, Thailand

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