viruses known as phages, found in our body's mucus, like in the mouth, nose, and digestive track—eww!—and phages actually kill unwanted bacteria
GB Virus-C (GBV-C). Over a billion people alive today have already been infected with it at some time in their lives. A few experiments suggest that when someone with HIV also gets infected with GBV-C, the spreading of HIV might decelerate. Some experts also believe that GBV-C might help a person survive Ebola
oncolytic viruses as a treatment for certain types of tumors. One of the benefits of using oncolytic viruses as a cancer treatment is that it provides an alternative to chemotherapy or can administered along with radiation and chemotherapy
The cowpox virus is considered as a helpful virus. They prevent smallpox viruses