Modelling the relative benefits of using the measles vaccine outside cold chain for outbreak response.
MetadataShow full item record
AbstractIntroduction: Rapid outbreak response vaccination is a strategy for measles control and elimination. Measles vaccines must be stored and transported within a specified temperature range, but this can present significant challenges when targeting remote populations. Measles vaccine licensure for delivery outside cold chain (OCC) could provide more vaccine transport/storage space without ice packs, and a solution to shorten response times. However, due to vaccine safety and wastage considerations, the OCC strategy will require other operational changes, potentially including the use of 1-dose (monodose) instead of 10-dose vials, requiring larger transport/storage equipment currently achieved with 10-dose vials. These trade-offs require quantitative comparisons of vaccine delivery options to evaluate their relative benefits. Methods: We developed a modelling framework combining elements of the vaccine supply chain - cold chain, vial, team, and transport equipment types - with a measles transmission dynamics model to compare vaccine delivery options. We compared 10 strategies resulting from combinations of the vaccine supply elements and grouped into three main classes: OCC, partial cold chain (PCC), and full cold chain (FCC). For each strategy, we explored a campaign with 20 teams sequentially targeting 5 locations with 100,000 individuals each. We characterised the time needed to freeze ice packs and complete the campaign (campaign duration), vaccination coverage, and cases averted, assuming a fixed pre-deployment delay before campaign commencement. We performed sensitivity analyses of the pre-deployment delay, population sizes, and two team allocation schemes. Results: The OCC, PCC, and FCC strategies achieve campaign durations of 50, 51, and 52 days, respectively. Nine of the ten strategies can achieve a vaccination coverage of 80%, and OCC averts the most cases. Discussion: The OCC strategy, therefore, presents improved operational and epidemiological outcomes relative to current practice and the other options considered.
- The value of tailoring vial sizes to populations and locations.
- Authors: Wedlock PT, Mitgang EA, Haidari LA, Prosser W, Brown ST, Krudwig K, Siegmund SS, DePasse JV, Bakal J, Leonard J, Welling J, Steinglass R, Mwansa FD, Phiri G, Lee BY
- Issue date: 2019 Jan 21
- Evaluation of the stability of measles vaccine out of the cold chain under extended controlled temperature conditions.
- Authors: Juan-Giner A, Alsalhani A, Panunzi I, Lambert V, Van Herp M, Gairola S
- Issue date: 2020 Mar 4
- Hepatitis B vaccine stored outside the cold chain setting: a pilot study in rural Lao PDR.
- Authors: Kolwaite AR, Xeuatvongsa A, Ramirez-Gonzalez A, Wannemuehler K, Vongxay V, Vilayvone V, Hennessey K, Patel MK
- Issue date: 2016 Jun 14
- Impact of changing the measles vaccine vial size on Niger's vaccine supply chain: a computational model.
- Authors: Assi TM, Brown ST, Djibo A, Norman BA, Rajgopal J, Welling JS, Chen SI, Bailey RR, Kone S, Kenea H, Connor DL, Wateska AR, Jana A, Wisniewski SR, Van Panhuis WG, Burke DS, Lee BY
- Issue date: 2011 Jun 2
- Dual-chamber injection device for measles-rubella vaccine: The potential impact of introducing varying sizes of the devices in 3 countries.
- Authors: Wedlock PT, Mitgang EA, Siegmund SS, DePasse J, Bakal J, Leonard J, Welling J, Brown ST, Lee BY
- Issue date: 2018 Sep 18