As a professor and researcher, Dr. Karriker has been working with swine disease diagnosis and treatment, as well as assessing new intervention strategies for the pig industry. He points out that genes that are resistant against some antibiotics such as Colistin could already exist, but at a low level, since this antibiotic has not been used so widely. However, it is very complex to cite the causes of the introduction of new resistant genes, since many factors are involved. Do you agree?