Vaccination against Streptococcus suis: Effect on nursery mortality

Methods: A field trial was conducted on one group of nursery pigs (N=330). Pigs were randomly allocated to one of four groups that each received one of the following treatments at weaning: an experimental autogenous vaccine administered intramuscularly (IM) (n = 90); a standard autogenous vaccine administered IM (n = 90); a commercial bacterin, administered intraperitoneally (IP) (n = 60); or no vaccine (n = 90). Nursery mortality was monitored from the start of the trial (18 days of age) until the end of the nursery period (9 weeks of age).