When ducks are injected with formalin-inactivated P. lophurae in combination with a lanolin-like substance, paraffin oil and killed tubercle bacilli, they develop considerable resistance to subsequent infection with P. lophurae.

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An investigation of the possibility of treating cases of pneumonia with specific antisera other than T y p e I and T y p e I I antisera was undertaken because clinical results indicated t h a t pneumonia cases were benefited slightly, if at all, b y t r e a t m e n t with heterologous antisera. For this purpose it was necessary to classify further the infecting types of pneumoeocci, to prepare diagnostic antisera for their identification and specific therapeutic antisera for treatment.

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