[The importance of dermonecrotoxin and dermonecrotoxoid of Pasteurella multocida for the calf]

The i. m. application of dermonecrotoxin of P. multocida var. D led to an atrophy of nasal conchae, liver-swelling and to induration of liver and spleen. The intratracheal application caused a lobular pneumonia. The vaccination with toxoid resulted in an immunity against a challenge with toxin but not with P. multocida var. D. Correlations between antitoxic serum-titers and immunity have to be investigated in future.