Additionally, H. pylori secretes an enzyme, urease, which converts biological wastes into ammonia. When ammonia surrounds H. pylori, it helps neutralize the acidity promoting bacterial survival. The ability of H. pylori to get into the stomach lining provides additional protection from immune cells which cannot efficiently reach the bacteria. The Centers for Disease Control (CDC) estimates that H. pylori has infected two-thirds of the world’s population. In most cases, H. pylori does not cause notable.