mock-infect \ mock-virusThe piglets were randomly assigned to one of four treatment groups:mockinfected；PRRSV-infected ； PRCV-infected；and PRCV/PRRSV-infected.

mock-infect \ mock-virusThe piglets were randomly assigned to one of four treatment groups:mockinfected；PRRSV-infected ； PRCV-infected；and PRCV/PRRSV-infected.
mock-infect \ mock-virus
The piglets were randomly assigned to one of four treatment groups:mockinfected
；PRRSV-infected ； PRCV-infected；and PRCV/PRRSV-infected.

mock-infect \ mock-virusThe piglets were randomly assigned to one of four treatment groups:mockinfected；PRRSV-infected ； PRCV-infected；and PRCV/PRRSV-infected.
小猪随机分为四组：对照组、猪繁殖与呼吸综合征病毒感染组、猪呼吸道冠状病毒感染组及两种病毒混合感染组

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