82957 Prevalence of Streptococcus suis in Tonsils of Nursery Pigs Raised in an Evaporative House(Thai)

Abstract

Although pigs appear healthy, harboring Streptococcus suis in their tonsils makes them important carriers
of the disease in the farm. The purpose of this study was to follow prevalence of S. suis in the tonsils of nursery
pigs raised in an evaporative house. Tonsil swabs were collected from the same pigs at 7 (n = 63) and 8 (n = 73) weeks of age and were cultured for S. suis . Prevalence of S. suis was 6.12% and 14.7% at 7 and 8 weeks, respectively. The rate of S. suis colonization was not statistically different (p< 0.05) although it tended to
increase with the pig’s age. Prevalence of S. suis in the nursery pigs was markedly low when compared to other
studies. The transmission of S. suis on this farm was minimal. This was probably due to the pigs having been
injected with antibiotics at the day of weaning and having been raised in the evaporative house.