Outbreaks of faecal-orally transmitted diseases in displacement camps: A scoping review of pathogens, risk factors, exposure routes, and drivers of transmission

Many forcibly displaced people reside in camps characterised by precarious living conditions, exposing them to numerous health risks. This scoping review elucidated the risk factors and exposure routes implicated in outbreaks of faecal-oral pathogens in camps, as well as the context-specific drivers of transmission that shape these outbreaks. Journal articles were identified from PubMed, Embase, Scopus, and Web of Science. Portals for grey literature were also searched. A total of 48 records, published between 1937 and 2022, were included in the analysis. Cholera outbreaks were the most frequently reported. Risk factors included drinking water from shallow wells and rivers, consuming ice and leftover food, and inconsistent handwashing. These indicate exposure through vehicles of transmission in both public and domestic domains, emphasising the importance of a multipronged approach to outbreak prevention and control. Outbreaks were often exacerbated by extreme weather events and acute population influxes that damage or overwhelm water and sanitation facilities. Such shocks warrant explicit recommendations in preparedness and response guidelines. Development projects and outbreak response measures in surrounding areas may reduce the risk of importing pathogens into camps. Future research could further investigate faecal-oral pathogens other than Vibrio cholerae and analyse the co-occurrence of the identified transmission drivers.