Effects of liquid paraffin on antibody responses and local adverse reactions after intramuscular injection of oil adjuvanted vaccines containing Newcastle disease (ND) and infectious bronchitis (IB) virus were investigated in chickens. Each vaccine was prepared with a liquid paraffin such as Carnation®, Crystol 52® and Lytol®. These vaccines induced sustained antibody responses against ND and IB. Among local adverse reactions, Lytol® induced granulomatous reactions and abscesses, but Carnation® and Crystol 52® did not. The residual weight of liquid paraffin at the injection site decreased in the order Carnation®, Crystol 52®, Lytol®. Crystol 52® was composed of relatively few short-chain hydrocarbons (i.e., <n-C16H 34) and long-chain hydrocarbons (i.e., >n-C20H 42). The vaccine with liquid paraffin mainly composed of n-C16H34~n-C20H42 was suggested to induce fewer adverse reactions.
Journal of The Japanese Society of Veterinary Science