![Reproductive failure caused by PRRSV](https://www.pig333.com/3tres3_common/art/pig333/10359/reproductive-failure-caused-by-prrsv_92142.jpg?w=650&h=366&ho=1&t=1653979446)
Control of reproductive PRRS outbreak by type 1 PRRS vaccine
In Korea, it is common to vaccinate sows as a whole-herd mass vaccination program, where all sows are vaccinated quarterly with a type 2 PRRSV vaccine. Therefore, it is recommended to vaccinate breeding females quarterly with additional type 1 PRRSV vaccine to control type 1 PRRSV infection.