What is the Knowledge Hub?
Explore the VoICE Knowledge Hub—a searchable database featuring the latest peer-reviewed research on immunization benefits, especially in low- and middle-income countries. Browse the Knowledge Hub using a variety of different filters to find vaccine evidence based on country, region, topic, or disease. Click on a tag to find more evidence on a specific area, such as the return on investment of vaccines or impacts of infectious disease outbreaks.
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A study in Jordan found that a proactive vaccination campaign has maintained high immunity rates, even with an influx of refugees
The results of a 2016 cross-sectional polio serosurvey found that the Jordan Ministry of Health’s proactive campaign to locate and vaccinate high-risk populations has been successful in maintaining high population immunity — even with a recent influx of refugees from Syria. The study included a community sample of 479 children under 5 years living in areas of Jordan identified as high risk due to being hard-to-reach, having high numbers of refugees, and lower vaccine coverage (under 90%). Polio immunity was found to be over 96% for polio types 1, 2, and 3 even for children living in refugee camps.
Farag NH, Wannemuehler K, Weldon W et al.. 2020. Estimating population immunity to poliovirus in Jordan’s high-risk areas. Human Vaccines & Immunotherapeutics. 16(3).
Conflict and migration can lead to disease outbreaks in previously controlled diseases
Large measles outbreaks occurred in Lebanon and Jordan, following an influx of Syrian refuges migrating to escape conflict. In Lebanon, the measles incidence increased 200-fold in one year following high migration. There were 2.1 measles cases per million population in Lebanon in 2012; this increased to 411 cases per million in 2013.
Teleb N. and Hajjej R.. 2017. Vaccine preventable diseases and immunization during humanitarian emergencies: challenges and lessons learned from the Eastern Mediterranean Region. East Mediterr Health J.. 22(11).