<p>Descriptive method was used. A line list of patients who developed the symptoms and consulted these health facilities above mentioned was constructed. Those symptoms are diarrhea, nausea, vomiting, abdominal pain, fever, headache, dizziness or asthenia. Every patient that presented at least three of these symptoms was selected. Using a questionnaire, demographic, clinical, laboratory and environmental assessment characteristics were recorded on each patient and analyzed using Excel software.</p>