Building evidences in Public Health Emergency Preparedness ("BePHEP" Project)-a systematic review

Humanitarian crises exacerbate the vulnerability of already fragile healthcare systems and significantly increase the risk of infectious disease outbreaks in low- and middle-income countries (LMICs). This systematic review aims to evaluate strategies and interventions implemented in LMICs to prevent and manage infectious diseases outbreaks during humanitarian crises from 2018 to 2023.

A comprehensive literature search was conducted across Scopus, PubMed, and Web of Science, adhering to the PRISMA guideline and the SPIDER framework to identify relevant studies. The review included studies published between 2018 and 2023 focusing on infectious disease prevention and management in LMICs during humanitarian crises. Study quality was assessed using the Joanna Briggs Institute checklist.

Eleven studies were identified from 1,415 unique articles. These studies addressed diverse interventions, including vaccination campaigns, epidemiologic surveillance, and integrated health services. Cholera outbreaks in Haiti and Mozambique, triggered by gang violence, internal migration, and Cyclone Kenneth, were addressed through epidemiological surveillance, case management, WASH (Water, Sanitation, and Hygiene) service improvements, and oral vaccination campaigns. Mathematical models guided cholera vaccination in Thailand's refugee camps. In India, surveillance and rapid response measures successfully prevented infectious disease outbreaks during the Kumbh Mela gathering. The Philippines improved response times to climate-related disasters using point-of-care testing and spatial care pathways. Despite challenges in Yemen, evaluating malaria surveillance systems led to recommendations for integrating multiple systems. Uganda developed a national multi-hazard emergency plan incorporating vaccination, communication, and risk management, proving useful during the refugee crisis and Ebola outbreak. In South Sudan, integrating immunisation services into nutrition centres increased vaccination coverage among children. Nigeria experienced a rise in measles cases during armed conflicts despite vaccination efforts, while visual communication strategies improved SARS-CoV-2 vaccination rates.

These interventions highlight the importance of multimodal, targeted, and collaborative responses to address complex health crises without relying on unsustainable investments. Despite the effectiveness of these interventions, infrastructure limitations, insecurity, and logistical constraints were noted. These findings emphasize the need for adaptable and resilient healthcare systems and international collaboration to safeguard the right to health during complex humanitarian crises.