Samples of 229 sylvan animals were investigated for tularaemia both by the FA-test as wrll as by histopathological and/or conventional barteriological investigations. For the FA-test we used fluorescein isothiocyanate labelled anti-F. tularensis globulin from a man who had just recovered from tularaemia. I n 124 cases where all three methods were used, there was complete agreement in 85 cases (68 per cent). In 34 cases (27 per rent), the bacterio-
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