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mately 15 shelters, including a school gymnasium. On the 2nd day after the debris flow, these people were re-evacuated by bus to 2 hotels in Atami city. The Shizuoka prefecture government requested the dispatch of Shizuoka Disaster Medical Assis-tance Teams (DMATs). DMATs are mobile, trained medical teams that can be rapidly deployed during the acute phase of a sudden-onset disaster1). Shizuoka prefecture trains DMAT members itself and has used them to assist public health centers in the COVID-19 pandemic2). Shizuoka during However, this is the first experience of dispatching Shizuoka DMATs for an actual natural disaster in Shizuoka. Our hospital dispatched the Juntendo Shizuoka DMAT (JS-DMAT) to this disaster in response to a request from the Shizuoka prefecture government. We herein report the activities of the JS-DMAT, which was dispatched to the 2021 Atami debris flow.Day 1 (Saturday, July 3, 2021): At 17:30 p.m., the Shizuoka prefecture government requested the On July 3, 2021, a debris flow (black line) occurred in the Izuyama area.Map provided by the Ministry of Land, Infrastructure, Transport and Tourism of Japan.Figure 1　Map of landslide hazards in Atami citydispatch of Shizuoka DMATs; however, the Meteo-rological Agency forecast recommended that resi-dents of Atami city should act to protect their own lives due to landslides and flooding as a result of continuous heavy rain. Accordingly, Juntendo Shizuoka Hospital postponed the dispatch of the JS-DMAT to secure the safety of the team. Despite the danger, some members of Shizuoka DMATs moved to a public health center (PHC) in Atami city, which was a gathering place for Shizuoka DMATs. As this was a PHC holiday and there were no medical staff, the members tried to estab-lish a DMAT headquarters in the PHC of Atami city (HQ-D-PHC) by explaining the significance of the DMAT to the PHC staff who were on duty. Then, the members of the Shizuoka DMAT collected information on victims from two local medical hospitals, which were classified as level II acute critical hospitals (there was no level I acute critical hospital in Atami city, Juntendo Shizuoka Hospital was the level I acute critical care hospital that was in charge of Atami city), investigated the capacity to receive patients in other hospitals in 5432．Report