Cost-effectiveness evaluation of quadrivalent influenza vaccines for seasonal influenza prevention: a dynamic modeling study of Canada and the United KingdomReport as inadecuate




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BMC Infectious Diseases

, 15:465

First Online: 27 October 2015Received: 15 April 2015Accepted: 07 October 2015

Abstract

BackgroundThe adoption of quadrivalent influenza vaccine QIV to replace trivalent influenza vaccine TIV in immunization programs is growing worldwide, thus helping to address the problem of influenza B lineage mismatch. However, the price per dose of QIV is higher than that of TIV. In such circumstances, cost-effectiveness analyses provide important and relevant information to inform national health recommendations and implementation decisions. This analysis assessed potential vaccine impacts and cost-effectiveness of a country-wide switch from TIV to QIV, in Canada and the UK, from a third-party payer perspective.

MethodsAn age-stratified, dynamic four-strain transmission model which incorporates strain interaction, transmission-rate seasonality and age-specific mixing in the population was used. Model input data were obtained from published literature and online databases. In Canada, we evaluated a switch from TIV to QIV in the entire population. For the UK, we considered two strategies: Children aged 2–17 years who receive the live-attenuated influenza vaccine LAIV switch to the quadrivalent formulation QLAIV, while individuals aged > 18 years switch from TIV to QIV. Two different vaccination uptake scenarios in children UK1 and UK2, which differ in the vaccine uptake level were considered. Health and cost outcomes for both vaccination strategies, and the cost-effectiveness of switching from TIV-LAIV to QIV-QLAIV, were estimated from the payer perspective. For Canada and the UK, cost and outcomes were discounted using 5 % and 3.5 % per year, respectively.

ResultsOverall, in an average influenza season, our model predicts that a nationwide switch from TIV to QIV would prevent 4.6 % influenza cases, 4.9 % general practitioner GP visits, 5.7 % each of emergency room ER visits and hospitalizations, and 6.8 % deaths in Canada. In the UK UK1-UK2, implementing QIV would prevent 1.4 %-1.8 % of influenza cases, 1.6 %-2.0 % each of GP and ER visits, 1.5 %-1.9 % of hospitalizations and 4.3 %-4.9 % of deaths. Discounted incremental cost-utility ratios of $7,961 and £7,989-£7,234 per quality-adjusted life-year QALY gained are estimated for Canada and the UK UK1-UK2, both of which are well within their respective cost-effectiveness threshold values.

ConclusionsSwitching from TIV to QIV is expected to be a cost-effective strategy to further reduce the burden of influenza in both countries.

KeywordsVaccination Transmission Cost-effectiveness Canada UK Influenza Dynamic QIV TIV AbbreviationsCIconfidence interval

CIHICanadian Institute for Health Information

ERemergency room

GPgeneral practitioner

LAIVlive-attenuated influenza vaccine trivalent

ICURincremental cost-utility ratio

LYlife-year

PSAProbabilistic sensitivity analysis

QALYquality-adjusted life-year

QIVquadrivalent influenza vaccine

QLAIVquadrivalent LAIV

TIVtrivalent influenza vaccine

UKUnited Kingdom

USUnited States of America

WHOWorld Health Organization

Electronic supplementary materialThe online version of this article doi:10.1186-s12879-015-1193-4 contains supplementary material, which is available to authorized users.

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Author: Edward W. Thommes - Afisi Ismaila - Ayman Chit - Genevieve Meier - Christopher T. Bauch

Source: https://link.springer.com/







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