Studied was the effect of an experimental infection of lambs with 1000 and 4000 larvae of Oesophagostomum venulosum on the activity of some more important serum enzymes, the level of sulfhydryl groups, and the level of sugar. It was found that the activity of glutamic acid oxal-acetate transaminase and lactic acid dehydrogenase rose, and that of alkaline phosphatase dropped. At 4000 larvae the level of glutamic acid pyruvate transaminase rose. The concentration of blood sugar dropped. There was also a drop of the SH groups. It was best manifested from the first to the third week following infection. In the fourth week the level of the total and residual SH groups showed a trend toward coming back to normal, however, the initial values were not reached.
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