Do germs cause cancer?

Abstract

In 1983 Barry Marshall, an internist from Perth, Australia, discovered that a spiral bacterium called Helicobacter pylori causes most stomach ulcers. It turns out that it also causes most cases of stomach cancer. His discovery was a monumental step forward in medicine, taking patients from the realm of palliative treatments that left them ill into the territory of cures. Now doctors test ulcer patients for the bacterium and treat those who have it with powerful doses of antibiotics such as Omeprazole, Clarithromycin and Amoxicillin.