biological assays carried out in the republic of ireland in naturally sensitized ( m. bovis infected ) tuberculous cattle have shown that rotterdam and weybridge bovine ppd tuberculins issued for routine use in 1981 and 1982 were equipotent with an estimated potency of about 24,000 community tuberculin units ( c.t.u . ) per mg of ppd .
C0041296
tuberculous
C0034131
ppd