Changes

**Avian and bovine tuberculin (purified protein derivative) is injected intradermally into two different clipped sites on the side of the neck

**Avian and bovine tuberculin (purified protein derivative) is injected intradermally into two different clipped sites on the side of the neck

**Skin thickness at these sites is compared before and 72 hours after the injection of tuberculin with calipers

**Skin thickness at these sites is compared before and 72 hours after the injection of tuberculin with calipers

**Increases in skin thickness at the bovine PPD site of more than 4cm greater than the avian PPD site are seen as positive (reactor)

**Increases in skin thickness at the bovine PPD site of more than 4mm greater than the avian PPD site are seen as positive (reactor)

**Blood tests including the gamma interferon assay are being developed

**Blood tests including the gamma interferon assay are being developed

**Laboratory examination of lesions, lymph nodes and milk

**Laboratory examination of lesions, lymph nodes and milk

*Control

*Control

**Eradication programs using a test and slaughter policy

**Eradication programs using a test and slaughter policy

**Reactors positive to the tuberculin test are slaughtered and restrictions applied to the affected herd  

**Reactors positive to the tuberculin test are slaughtered and restrictions applied to the affected herd

 

===Avian tuberculosis===

===Avian tuberculosis===