The Thai Journal of Veterinary Medicine


Streptococcal infection is a major problem in intensive tilapia farming. This study was conducted to investigate the antimicrobial activity of mucilage, distilled water- and 70% methanol-crude extract from Butea superba Roxb. against Streptococcal bacteria. The antimicrobial activity using disc diffusion assay showed that B. superba Roxb. had a broad antimicrobial range against twelve isolates of streptococcal bacteria: Streptococcus iniae (n=2) and Streptococcus agalactiae (n=10). The minimum inhibitory concentration (MIC) of the 70% methanol-crude extract varied between 128 and 512 µg/ml depending on the tested streptococcal strains. Mucilage has a higher potency in the inhibition of streptococcal bacteria when compared with the 70% methanol-crude extract. However, distilled watercrude extract had no efficiency of inhibiting the growth of microorganism.


Faculty of Veterinary Science, Chulalongkorn University

First Page


Last Page