Transfer Factor Oral Solution is a kind of medicine with good immune enhancement effect, the specific price cannot be generalized, it needs to be slightly different according to the size of the city and the level of the hospital. Usually, the price of transfer factor oral solution is relatively expensive in provincial capitals and tertiary hospitals, ranging from 28.9 to 32.5 RMB per box of 20 units. In second-tier cities and Level 3B and Level 2A hospitals, the price of transfer factor oral solution is relatively cheaper, usually ranging from RMB 18.9-25.5. In third-tier cities and third-class hospitals, the price of transfer factor oral solution is the cheapest, usually ranging from 15.8-19.7 yuan, depending on the manufacturer, the price varies slightly.