Estimating and monitoring yellow fever reactive campaign vaccination coverage: overview of survey and monitoring methods

Overview

Yellow fever (YF) is an acute viral haemorrhagic disease transmitted by infected mosquitoes. YF is prevented by a highly effective, safe and affordable vaccine: a single dose of vaccine provides sustained immunity and lifelong protection against YF disease.

Unprecedented urban outbreaks in 2016 in Angola and the Democratic Republic of the Congo demonstrated that, despite routine immunization, challenges remain in ending YF epidemics. Outbreaks occur in Africa and the Americas, but there is also increased risk of international spread through viraemic travellers, as seen in 2017 with YF cases who travelled to China.

The comprehensive global strategy Eliminate Yellow fever Epidemics (EYE) is a coalition of partners (Gavi, the Vaccine Alliance, the United Nations Children’s Fund and WHO) and affected countries set up in response to these challenges. The EYE Strategy is aligned to face YF’s changing epidemiology, the resurgence of mosquitoes, and the increased risk of urban outbreaks and international spread.