Why can population displacement after a disaster create health risks?

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In the context of disaster epidemiology, population displacement creates significant health risks primarily by disrupting essential services and creating precarious living conditions.1

When large populations are displaced, the following factors contribute to increased health vulnerabilities:

Environmental Exposure: The loss of shelter leaves individuals vulnerable to the elements, which can lead to immediate health crises.1
Overcrowding: Displaced persons often congregate in temporary shelters where high population density facilitates the rapid spread of infectious disease.1
Service Disruption: The breakdown of local health infrastructure hinders the ability to manage existing health needs or respond to new outbreaks.1
Nutritional Concerns: In the long term, displacement often compromises the ability to provide adequate food supplies to the affected population.1

While infectious disease outbreaks are not always the immediate primary concern following a disaster, the risk significantly increases one to two weeks after an event if substantial displacement and the disruption of health services persist. Addressing these risks requires rapid needs assessments and the establishment of surveillance systems to prioritize interventions and protect vulnerable populations.1