Changming Guo, male, 1979, associate professor, School of Jilin University Animal Medicine. Jilin Province pig industry system post expert. Review expert of Heilongjiang Animal Science and Veterinary Medicine magazine. The main teaching subjects are veterinary diagnostics and veterinary internal medicine. Main research direction for pig epidemiology, animal disease inspection and veterinary diagnostics. Chief editor of Differential Diagnosis Manual of Swine Diseases and Veterinary Clinical Therapeutics, China Agriculture Press. 2 years veterinary technical working experience in pig farm, good at disease prevention.