| lethal toxins and cross-neutralization of venoms from the african water cobras, boulengerina annulata annulata and boulengerina christyi. | venoms of the water cobras, boulengerina, were assayed for lethality, proteolytic activity and protein content. boulengerina annulata annulata and b. christyi venoms averaged 89% protein and lacked proteolytic activity. the murine i.p. ld50 of b. a. annulata and b. christyi venoms were 0.143 and 0.120 mg/kg, respectively. polyvalent antivenom produced by the south african institute of medical research neutralized 575 and 200 ld50 of b. a. annulata and b. christyi venoms/ml antivenom, respectivel ... | 1991 | 1814007 |