We do to a point. Mostly since I've gotten into more breeding stock with the poultry and we invested a lot of $$ in dairy sheep.
If someone is from a farm or has been visiting a different farm within the previous 2 weeks, they have to wear plastic boots and are not allowed IN the pens.
We are more lax with non-farm visitors.
All incoming animals are quarantined and we do not wear our farm boots/clothing off the property.