| dc.description.abstract | Outbreaks of acute gastroenteritis are a public health problem. Norovirus is known as the most common cause
(50%). In Chile, immediate notifi cation allows surveillance of these events. We describe an acute gastroenteritis
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 defi nition 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 determined
the presence of norovirus genogroup II in clinical and environmental samples. This outbreak was caused
by consumption of raw vegetables from La Chimba, which were watered and contaminated with treated sewage
containing low concentration of free residual chlorine. Subsequently, the outbreak spread from person to person
in a poor sanitary environment. | |
