Tumor homing bacteria is a group of facultative or obligate anaerobic bacteria (capable of producing ATP when oxygen is absent or is destroyed in normal oxygen levels) that are able to target cancerous cells in the body, suppress tumor growth and survive in the body for a long time even after the infection. When this type of bacteria is administered into the body it migrates to the cancerous tissues and starts to grow, then deploys distinct mechanisms to destroy solid tumors. Each bacteria species uses a different process to eliminate the tumor.