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The usefulness of prolidase as a biochemical parameter to represent the chronic state of hepatic abscess was discussed in eight cattle experimentally inoculated with Fusobacterium necrophorum and 18 spontaneously affected cattle. Blood was daily collected to measure the plasma prolidase activity and sialic acid level from the experimental cattle for 90 days after inoculation. In three out of four cattle affected with hepatic abscess, prolidase activity began to rise about 40 days after inoculation, and maintained high activity till 90 days. In the same cattle the sialic acid concentration increased from 7 to 10 days after inoculation, and gradually returned to the normal value 50 days after it. Another cow showed a similar change in early stage of experiment, but prolidase activity decreased after 70 days and sialic acid concentration maintained high level till 90 days. In two cattle, which showed scars but no abscess on autopsy, the prolidase activity increased temporarily from 40 to 55 days after inoculation. In the control cattle inoculated with an inactivated bacterial suspension, neither the sialic acid level nor the prolidase activity showed any large variation in the experimental period. Among the spontaneously affected cattle, those with a high sialic acid level revealed normal prolidase activity and those with a normal sialic acid level had high prolidase activity.

Plasma prolidase activity as a possible diagnostic index of chronic hepatic abscess in cattle.