Theoretical immunology tells us that with an inactivated vaccine, two doses are necessary to achieve peak immunity. This is very important with M. hyo since we want long-lasting immunity.

• 根据免疫学理论，灭活苗二针免疫才能达到免疫力高峰。这对于肺炎支原体免疫极为重要，因为我们希望支原体的免疫力持久（直到出栏）