In 1993, in the northwestern United States, 4 people died and 700 became ill after eating undercooked hamburgers in a popular restaurant chain. In recent years outbreaks have also occurred in Africa, Australia, Europe, and Japan.
यह अनुमान लगाया जाता है कि वर्ष २००० तक, भारत में क़रीब ५० लाख से ८० लाख ऐसे लोग होंगे जो एच. आई.