In very rare cases, individual shock reactions with a potentially fatal outcome might occur.In very rare cases, transient lethargy in piglets has been observed.In target animal safety studies, administration of the maximum recommended injection volume (5 ml) very commonly caused slight swellings at the injection site that were not painful on palpation. Swellings persisted for up to 3 days. Pathomorphological injection site reactions resolved completely within 21 days.During clinical trials, pain on injection and injection site swellings were seen very commonly in treated pigs. These swellings resolved within 1 to 6 days.