Mapping vaccination coverage to explore the effects of delivery mechanisms and inform vaccination strategies.

Authors:
Julia Thorley
Julia Thorley
University of Southampton
Victor A Alegana
Victor A Alegana
University of Southampton
Matthew J Ferrari
Matthew J Ferrari
Pennsylvania State University
Saki Takahashi
Saki Takahashi
University of Miyazaki
Japan
Justin Lessler
Justin Lessler
Johns Hopkins Bloomberg School of Public Health
Felicity T Cutts
Felicity T Cutts
London School of Hygiene and Tropical Medicine
United Kingdom

Nat Commun 2019 04 9;10(1):1633. Epub 2019 Apr 9.

WorldPop, School of Geography and Environmental Science, University of Southampton, Southampton, SO17 1BJ, UK.

The success of vaccination programs depends largely on the mechanisms used in vaccine delivery. National immunization programs offer childhood vaccines through fixed and outreach services within the health system and often, additional supplementary immunization activities (SIAs) are undertaken to fill gaps and boost coverage. Here, we map predicted coverage at 1 × 1 km spatial resolution in five low- and middle-income countries to identify areas that are under-vaccinated via each delivery method using Demographic and Health Surveys data. We compare estimates of the coverage of the third dose of diphtheria-tetanus-pertussis-containing vaccine (DTP3), which is typically delivered through routine immunization (RI), with those of measles-containing vaccine (MCV) for which SIAs are also undertaken. We find that SIAs have boosted MCV coverage in some places, but not in others, particularly where RI had been deficient, as depicted by DTP coverage. The modelling approaches outlined here can help to guide geographical prioritization and strategy design.

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Source
http://dx.doi.org/10.1038/s41467-019-09611-1DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6456602PMC
April 2019
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