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Flood-associated disease outbreaks and transmission in Southeast Asia - Introduction 3


Authors: Boonfei Tan 1

Source: Frontiers

Photo/Image Source: Unsplash




Introduction 3

In the aftermath of disasters, displacement, disruption of medical services, and damage to health and civil infrastructure are the most visible effects (Wisner and Adams, 2002). Less apparent, however, are ecosystem-level changes that may heighten health risks. From an environmental perspective, climate change and extreme weather events are increasingly recognized as drivers of contaminant mobilization, fate, and transport. Both chemical and microbial hazards can persist and move through complex pathways, creating cross-sectoral risks for ecosystems and public health (Mora et al., 2022; Bolan et al., 2024; Crawford et al., 2022; Laino and Iglesias, 2025; Noyes et al., 2025; Uwishema et al., 2023; Zitoun et al., 2024). These dynamics are particularly critical in SEA, where recurrent floods and heavy rainfall across AMS repeatedly expose populations to unsafe water. In this setting, floodwaters act as vehicles for pathogens already present at low levels in the environment, while socio-economic vulnerabilities (Rentschler et al., 2022) amplify transmission risks (Acosta-España et al., 2024). Against this backdrop, outbreaks of waterborne diseases have historically manifested after flood events, exemplified by the most recent cholera outbreak in Myanmar in 2024 (World Health Organization, 2025a). As of August 2025, several major cities in SEA were struck by massive floods, with numerous official (ADInet) and unofficial news outlets circulating reports of potential risks of outbreaks (ASEAN Coordinating Centre for Humanitarian Assistance on disaster management (AHA Centre), 2025

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