1. phage is used to prevent and treat Shigella dysenteriae, drug-resistant Pseudomonas aeruginosa and Staphylococcus aureus infections in animals, and its therapeutic effect is better than that of drugs. Yu He, a famous medical microbiologist in China, successfully prevented Pseudomonas aeruginosa from infecting burn patients in 1958, which became a famous story in the field of microbiology in China.

2. Frost-resistant phage can protect plants from frost.

3. Algae virus can eliminate the water pollution caused by algae. Experiments show that the algae polluting the water source are completely cracked and the water quality becomes clear 7 days after the application of LPP- 1 virus.

Insect virus has been successfully used to control pests. Rodent pox virus was used to kill rats in China, and the experimental infection mortality rate reached 100%.

5, used for the prevention and control of plant diseases. In recent years, it has been reported that fungal virus double-stranded RNA is used to control chestnut blight. China virologist Tian Bo and others successfully used satellite RNA to control diseases caused by cucumber mosaic virus.

6. Tool enzymes and genetic engineering vectors used in molecular biology and genetic engineering are all derived from viruses. Reverse transcriptase of avian tumor virus, T4DNA polymerase produced by bacteriophage T4, T4RNA ligase, T4DNA ligase and T4 polynucleotide kinase are important tools for genetic engineering.