P Patch test A skin test that can show which substances are causing contact dermatitis or eczema.
For example, one organic dairy farmer from Chepstow lost four cattle to the skin test in August 2005.
The second trial will involve using the ' severe ' interpretation of the tuberculin skin test for cattle.
Once you narrow it down to your favorite two or three, complete a skin test.
Lack of redness or swelling on a skin test indicates no allergic response.
