A major cause of death in recently weaned pigs is a bacterial infection Streptococcus suis. There are many strains which makes it difficult to control and vaccinate for. An autogenous bacterin vaccine was created for the strain SX-428 and measured for its effectiveness. The antibody levels and immunity in vaccinated pigs did not increase.
Poor Immunity from a Strep. suis Autogenous Bacterin (full article)
