[Neutralizing capacity of ++antiophidic sera against the venom of Bothrops moojeni (lance-headed viper)]. / Capacidad neutralizante de los sueros antiofídicos frente al veneno de Bothrops moojeni (caisaca, lanzadera).

In the production of current therapeutic antisera used in Argentina for Bothrops snakebite, the Bothrops moojeni venom is not used as immunogen, since this snake is not considered a serious public health problem. Accidents caused by this species have not been reported in this country even though Bothrops moojeni is not unfrequent in some regions of Misiones. Despite the high degree of immunological cross reactivity found among the Crotalinae venoms and, in this particular case, among the venoms from the Bothrops Genus, there exists a significant intraspecific variation in venom composition, particularly in specimens arising from different geographic regions. In this study, the antivenoms prepared at the Instituto Nacional de Producción de Biológicos A.N.L.I.S. Dr. Carlos G. Malbrán have been tested for their immunochemical cross reactivity and neutralizing ability of enzymatic and toxic activities of venom from Argentinian specimens of Bothrops moojeni from Misiones. Immunological cross-reactivity was tested by double-immunoprecipitation, immunoelectrophoresis, Western-blot and ELISA. Neutralizing ability of antivenoms against proteolytic, indirect hemolytic activity, procoagulant activity, he-morrhagic activity and necrotizing activity. The Lethal Dose 50 was 1.5 mg/kg body weight; this value is located in the range to those obtained with the venom from Brazilian specimens. It was observed that all the antivenoms exhibited a strong immunochemical cross reactivity and that they were able to neutralize in different degree both, enzymatic and toxic activities of B. moojeni venom. From these results, it can be assumed that the antivenom tested could be employed successfully in cases of B. moojeni snakebites.