Characterization of anti-crotalic antibodies

Area of Science:

• Toxicology
• Immunology
• Herpetology

Background:

• Crotalus durissus species cause severe snakebites in Brazil.
• Their venoms contain crotoxin, a neurotoxin composed of crotapotin and phospholipase A2 (PLA2).
• Specific antivenom is the primary treatment for these envenomations.

Purpose of the Study:

• To compare the efficacy of antivenoms produced using crude Crotalus durissus terrificus venom versus purified crotoxin or PLA2.
• To assess the cross-neutralization capabilities of these antivenoms against related Crotalus species.

Main Methods:

• Horses were immunized with either crude C. durissus terrificus venom, purified crotoxin, or purified PLA2.
• Resulting antisera were tested for their ability to recognize and neutralize toxins from C. durissus terrificus, C. d. collilineatus, C. d. cascavella, and C. d. marajoensis.

Main Results:

• Antisera from crude venom immunization recognized and neutralized toxins from all four Crotalus species.
• Antisera from purified crotoxin or PLA2 also showed cross-reactivity and neutralization, albeit with lower titers.
• Crude venom immunization provided broader protection against the venoms of the studied Crotalus species.

Conclusions:

• Crude Crotalus durissus terrificus venom is an effective immunogen for producing broad-spectrum antivenom.
• Antivenoms generated from crude venom offer effective neutralization against multiple Crotalus species found in Brazil.
• This finding supports the use of crude venom in antivenom production for improved therapeutic coverage.