If you test positive for COVID-19 would you go around to family gatherings? Or to this week’s cattle auction? Or would you stay home and self-isolate until you test negative? Self-isolating is key to stopping the spread of a virus. Again, a virus needs a host to spread. It won’t travel across the community by yourself.
Same goes for BVD-PI cattle, or any animal infected with a pathogen! Want to stop BVD? Find the PI animals and isolate them. How do you find them? Test for them. The BVDV virus isn’t going to travel from John’s ranch to Duke’s feedyard by itself, it needs an animal to infect first.
Test the cattle. Find the PI. Isolate from the herd. Get cattle fat, faster.
Pretty easy, ain’t it?