In most countries, BVDV is endemic and studies detecting antibody have estimated that between 70 and 100% of herds are either currently infected or have recently been infected with bovine viral diarrhoea virus<sup>23</sup>. | In most countries, BVDV is endemic and studies detecting antibody have estimated that between 70 and 100% of herds are either currently infected or have recently been infected with bovine viral diarrhoea virus<sup>23</sup>. |