H pylori is the short form of Helicobacter pylori. It is a helix shaped, the microaerophilic bacterium usually found in the upper part of the stomach. H pylori is also the common cause of peptic ulcers. It is present in more than 50 percent of the world’s population. It is most common in developing countries than in western countries.

The Helicobacter Pylori (commonly referred to as the H Pylori) are a family of bacteria which possess a spiral shape. They grow in the digestive tract of the human body and are capable of attacking the stomach lining. Although these bacteria are pretty harmless, they are culprits of most ulcers occurring in the stomach and small intestine.

Viral infections are commonly caused due to a host virus attack on the immune system. Since viruses cannot survive and grow on their own, they attach to cells in the body to introduce the genetic material of the carrier virus ultimately killing the host cell and replacing it with virus cell copies.

The human immunodeficiency virus (HIV) infection can cause a life-threatening disease called acquired immunodeficiency syndrome (AIDS). HIV attacks the immune system, which leaves the body unprotected from other infections. HIV specifically targets CD4 cells. These cells mainly aid the immune system in fighting infections. Early HIV positive symptoms can appear within a few weeks of contracting the virus.