Vaccination: information for farmers
A cow’s ability to avoid and fight infection is largely dependent on a range of defences which are collectively called immunity. Immunity includes physical barriers, such as skin, or a teat plug, for example; chemical immunity, such as from antibodies and inflammatory substances; and cells, which either actively seek and destroy pathogens (bugs) or produce antibodies to neutralise pathogens.
An animals permanently infected with BVD suffering with alopecia and skin lesions. PI animals are an infection risk to the entire herd and should be euthanased
©Mo Kemp