Table 3.

Serodiagnosis of bovine tuberculosis by ELISA technique using bovine PPD and commercial polypeptide antigen comparison to the results of tuberculin test.

Source	Number of tuberculin- positive cows	ELISA
		Polypeptide Ag.		Bovine PPD
		+ve	%	+ve	%
Cairo	31	28	90.32	29	93.54
El-Qalyubia	38	34	89.47	35	92.10
El-Sharkia	39	32	82.05	33	84.61
Total	108	94		97

ELISA=Enzyme-linked immunosorbent assay, PPD=Purified protein derivative