Antimicrobial activities of crude venoms (each disc contained 20 μl of 100 μg/ml) of different snake species tested against gram-negative Burkholderia pseudomallei. Following 24 h incubation at 37°C, zone of inhibition given by each venom was compared with that of the standard drug chloramphenicol (30 μg/disc). Inhibition zones against Burkholderia pseudomallei given by venoms of: (A) Daboia russelli russelli, (B) Agkistrodon halys, (C) Crotalus adamanteus, (D) Bitis gabonicarhinoceros. Rough wrinkled morphological features of gram-negative Burkholderia pseudomallei bacteria were grown on Tryptic Soy agar plates at 37°C. (E) bacilli after 36 h incubation, (F) prominent bacilli after 72 h incubation.