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www.sochinf.cl 19 Artículo Original Epidemiología Brote de gastroenteritis aguda en la Región de Antofagasta, Chile. 2010 Janepsy Díaz T., Verónica Solari G., Omar Cáceres C., Javier Mena A., Silvia Baeza P., Ximena Muñoz U., Miguel O´Ryan G., Héctor Galeno A., Aurora Maldonado B. y Nora Mamani M. Outbreaks of acute gastroenteritis in Antofagasta Region. Chile 2010 Outbreaks of acute gastroenteritis are a public health problem. Norovirus is known as the most common cause (50%). In Chile, immediate notification allows surveillance of these events. We describe an acute gastroenteri- tis outbreak that occurred in Antofagasta region, between March and April 2010. An observational study was conducted to perform the outbreak investigation. Local residents who met case definition were included. Stool samples, epidemiological surveys and environmental samples were requested. The outbreak began approximately on March 8, 2010 and lasted until April 28 with 31,036 reported cases (rate 54 per 1000 inhabitants). The most affected age group was between 25 and 44 years, and diarrhea was the main symptom (97% of cases). We deter- mined the presence of norovirus genogroup II in clinical and environ...