Changes

Persistently infected animals continuously shed large amounts of virus throughout their lives, providing a major source of infectious virus for naïve cattle²³. Persistently infected dams produce persistently infected calves, resulting in family lines capable of maintaining the virus in a herd³⁵. It is estimated that 1-2% of the cattle population up to 13% of foetal calves are persistently infected³⁴.

Persistently infected animals continuously shed large amounts of virus throughout their lives, providing a major source of infectious virus for naïve cattle²³. Persistently infected dams produce persistently infected calves, resulting in family lines capable of maintaining the virus in a herd³⁵. It is estimated that 1-2% of the cattle population up to 13% of foetal calves are persistently infected³⁴.

50% of persistently infected cattle die within the first year of life<Sup>33</sup>. Animals may be undersized and slow-growing, and are predisposed to other diseases⁴³.Persistent infection with BVDV is the prerequisite for developing mucosal disease.

50% of persistently infected cattle die within the first year of life<Sup>33</sup>. Animals may be undersized and slow-growing, and are predisposed to other diseases⁴³. Persistent infection with BVDV is the prerequisite for developing mucosal disease.

====Mucosal Disease====

====Mucosal Disease====