Biosecurity is protecting your herd against the introduction of biological agents. There are many areas that need to be addressed such as the facility itself. How far are the closest pigs? How many? Is the driveway gated with “No Entry” signs? Are there feed spills? Are the doors locked? Is there a rocked perimeter or standing water? Has there been any rodent baiting? You must also look at the source of your replacement animals, how are the animals hauled to the facility? Who takes care of isolation? Feed? Manure? Maintenance? Who is the source of your semen, how is it delivered? Do you know who comes and goes from the farm? Is there posted downtime requirements? Is the staff routinely trained on biosecurity? Who is in charge of communication with service personnel and shower facilities? Other areas that need to be checked are the load-inout facilities; supplies and maintenance, and the handling and removal of dead animals. Most importantly always quiz the farm employees because the weakest link needs to be identified. Most breakdowns in biosecurity are due to the lack of communication to employees. This is the only way to find out what really goes on at the farm.