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==Introduction==
==Introduction==
[[Image:Sensitisation phase Type IV Hypersensitivity.jpg|right|thumb|150px|Sensitisation phase: Type VI hypersensitivity-Brian Catchpole RVC 2008]]
[[Image:Sensitisation phase Type IV Hypersensitivity.jpg|right|thumb|150px|Sensitisation phase: Type VI hypersensitivity-Brian Catchpole RVC 2008]]
* It is used for TB testing cattle; the antigen is purified protein derivative-PPD from [[:Category:Mycobacterium species|''Mycobacterium tuberculosis'']].
* It is used for TB testing cattle; the antigen is purified protein derivative-PPD from [[:Category:Mycobacterium species|''Mycobacterium tuberculosis'']].
* Presently in the UK the animal is culled if it has a positive skin reaction.
* Presently in the UK the animal is culled if it has a positive skin reaction.
[[Category:Hypersensitivity]]
[[Category:Image Review]]