Single Intradermal Tuberculin testing

Single Intradermal tuberculin test is one of the standard diagnostic tools for detection of tuberculosis and paratuberculosis. It has sensitivity of 68-95% and specificity of 96-99%. It generally involves measurement of the swelling at injection site after 72 hours post injection. It is used at base of tail i.e. caudal skin also called as common fold test in United States, Canada, and New Zealand whereas at cervical skin fold on lateral aspect of the neck in Europe and United Kingdom. It is used primarily for detection of carriers in flock and distinction between vaccination against paratuberculosis and tuberculosis.