Geographically.?Ten cases from Mysore City, four (cases 2, 3, 12, 13) from different large villages, situated at a distance of up to 40 miles from Mysore, within the city three patients (cases 5, 6, 7) who lived in two opposite houses and fell ill within one and the same week; in cases 1 and 10 and 11 and 14, respectively, the patients lived close to each other but each of these couples lived i...