Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Helicobacter Pylori Infections ?
    ### Response:
    Helicobacter pylori (H. pylori) is a type of bacteria that causes infection in the stomach. It is found in about two-thirds of the world's population. It may be spread by unclean food and water, but researchers aren't sure. It causes Peptic ulcers and can also cause stomach cancer.
    