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  • Title: Quantitative measurement of endotoxin in rainbow trout (Salmo gairdneri) serum by the chromogenic substrate method.
    Author: Kodama H, Yamada F, Kurosawa T, Mikami T, Izawa H.
    Journal: J Appl Bacteriol; 1987 Sep; 63(3):255-60. PubMed ID: 3429359.
    Abstract:
    The amount of endotoxin in serum collected from normal rainbow trout (Salmo gairdneri) and trout inoculated with viable Vibrio anguillarum or lipopolysaccharide (LPS) extracted from bacteria was determined by the chromogenic substrate method. The mean values of endotoxin in four different groups of normal rainbow trout sera ranged from 31.9 to 65.3 pg/ml. When fish were inoculated with viable bacteria (1 x 10(8], they became septicaemic and a large amount of endotoxin ng/ml) was detected in the sera. In fish inoculated with a smaller number of bacteria the amount of endotoxin was several times higher than that of normal fish in spite of failure of bacterial isolation. Although the endotoxin level in serum increased rapidly (greater than 100 ng/ml) after intraperitoneal inoculation with purified V. anguillarum LPS (540 micrograms), no fish died during the experiment. The high level of endotoxin in normal rainbow trout and the resistance of trout to endotoxin are in striking contrast to those of mammalian and avian species.
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