Table 2. List of the test pathogenic bacteria Serial No Name of test organism Strain number Gram positive 1. Staphylococcus aureus ATCC-259233 2. Bacillus megaterium QL-38 3. Bacillus subtilis QL-40 4. Streptococcus--haemolyticus CRL 5. Sarcina lutea QL-166 Gram negative 6. Salmonella typhi - 7. Shigella dysenteriae AL-35587 8. Shigella flexneri AL-30372 9. Shigella shiga ATCC-26107 10. Shigella sonnei AJ-8992 11. Shigella boydil AL-17313 12. Beudomonas aeruginosa 13. Escherichia coli FPFC-1407 14. Kelesiella species Mst.Jesmin Sultana et al. Biological Characterization of Crude Extract & Pure Compound Isolated from Swertia chirata Ham. Biomedical Science and Engineering, 2014, Vol. 2, No. 1, 1-4. doi:10.12691/bse-2-1-1 © The Author(s) 2014. Published by Science and Education Publishing.