Abstract
SUMMARY A field trial was carried out in Nigeria with the comparative intradermal allergic test (CIDAT) for the diagnosis of contagious bovine pleuropneumonia (CBPP). No animals in the control group reacted to the test. In the vaccinated group 2·5% of the animals and in the infected group 15% of the animals gave positive reactions to the test. Animals with acute infection were negative to the CIDAT: the complement fixation test remains, therefore, the test of choice for identifying acute outbreaks of the disease. Animals recovered from the disease and those with chronic lesions of CBPP were positive to the test. This will confine its use to animals owned by government agencies, since nomadic tribesmen will not accept the slaughter of recovered animals.
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