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Use of the tetrazolium salt reduction test in the detection of phagocytic activity in pigs



Use of the tetrazolium salt reduction test in the detection of phagocytic activity in pigs



Veterinarni Medicina 34(4): 231-238



One of the indicators of non-specific, cell-mediated immunity can be the ability of phagocytic system to react to the presence of antigenic impulses and stimulators. The phagocytic activity induced in this way in vitro can be evaluated quantitatively by help of different methods. In this study the method of the reduction of colourless tetrazolium salt (INT) to the red formazane was used. The optimum conditions for carrying out this test in isolated peripheral pig leucocytes were determined. It was stated that 3-4 ml samples of pig blood, from which 6.10(6) leucocytes necessary for the test can be isolated, were sufficient for the examination of phagocytic activity. Further, 45 minutes were determined as the optimum time of incubation It was found that the INT test can be reproduced by 24 hours after blood sampling provided the blood is kept at the temperature of +4 degrees C. The INT test was used for examining 38 pig blood samples before and after myostress; this stress has a significant effect both on a decrease of phagocytic activity and on the ability of leucocytes to migrate in the LMI test. The INT test was further used for examining pigs before the administration of the first dose of the inactivated vaccine against the Aujeszky's disease virus and two days after; the application of the vaccine significantly increased the phagocytic activity.

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Accession: 041925948

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PMID: 2734992



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