1. Vaccines: Vaccines are made from virus to prevent certain viral diseases. Vaccines for smallpox, polio, dropsy, jaundice, cholera, plague, blood dysentery, typhoid etc. are made from virus.
2. As medicine: Some phage virus are used in cholera, typhoid, blood dysentery and plague.
3. Destruction of Harmful Bacteria: Virus benefit us by destroying harmful bacteria present in the environment. Faze virus destroys E. coli bacteria.
4. Control of Harmful Insects: Control of harmful insects has become possible with the help of virus. Nuclear polyhydrosis virus is used as an insecticide in the United States. Dr. Siddiq Publications
5. Research: Virus are currently being used in genetic and molecular biology research. Virus are used as vectors in genetic engineering.
6. Enhancement of flower beauty: White spots are formed on tulip flowers due to virus attack. It increases the beauty of flowers. It is called Broken Tulip. The market value of broken tulip flowers is high.
7. In biological research: virus are widely used in microbiology, medical science and genetic engineering research.
8. Bacteriophage therapy: Phage virus are used to destroy bacteria causing diseases such as typhoid, cholera, dysentery, plague etc.
9. Balancing marine ecosystems: Phage virus destroy marine bacteria and release huge amounts of CO2. It maintains the tectonic balance of the ocean. One milliliter of sea water contains one lakh viruses.
10. Biological Control: Currently virus are widely used in biological control worldwide. Myxoviruses are being used to control rabbits in Australia.
11. Evidence for Evolution: Virus are the greatest reservoir of biodiversity. It bears the characteristics of the living and the inanimate. Therefore, virus play an important role in uncovering information about the origin and evolution of organisms.