The Thai Journal of Veterinary Medicine


A total of 54 Streptococcus suis (S. suis) strains were isolated from 48 deceased pigs submitted for routine post mortem examination at the National Institute of Animal Health over a period of 1992-1995. The most isolations were from cases of meningitis and the less frequent ones were from septicemia, pneumonia, meningitis associated with pneumonia and abortion. A few strains were found in cases of arthritis, vaginitis, and abcessation. The age of pigs with meningitis was predominantly 4 - 8 weeks, while pigs with pneumonia were 5- 12 weeks old. Septicemia cases were usually seen in pigs aged 2 -14 weeks. The strains were identified by biochemical tests incorporating 1 to 8 and 15 capsular typing. All capsular types were found. The most common capsular types were 8, 7 and 2. Only one strain of types 5 and 6 and one untypable strain was found. Capsular types 2 and 8 were more commonly isolated from meningitis than other types. More than one capsular type was detected in some cases, mainly in those with meningitis. The antimicrobial susceptibility of the 35 isolates were tested against 15 drugs. It was found that the most sensitive drugs were cephalothin (86%), bacitracin (77%), chloramphenicol (74%) and gentamicin (74%).

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