Which bacteria causes peptic ulcers? Who discovered it?

Peptic ulcers:

1. Helicobacter pylori bacteria cause peptic ulcers.
2. Peptic ulcer is an open sore that develops in the stomach, duodenum part of the small intestine, and esophagus when the digestive juices wear away the lining of the digestive system

Discoverers:-

1. Peptic ulcers were discovered by two Australian researchers Bary .J.Marshall and Robin Warren in the year of 1982.
2. They won a Nobel prize in the field of medicine/ physiology in the year 2005 for their discovery of peptic ulcers.