When Tarantula Venom Comes from a Misnamed Spider: The Importance of Taxonomic Accuracy in Theraphosid Toxinology

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  When Tarantula Venom Comes from a Misnamed Spider: The Importance of Taxonomic Accuracy in Theraphosid Toxinology I am very happy to share my most recent publication in Toxicon. This is a particularly meaningful publication for me because it brings together two areas that have become an important part of my work and personal interests: tarantulas and toxinology. At first glance, taxonomy and venom research may seem like two very different fields. In reality, they are closely connected. Before we can properly study the venom of a spider, we need to know which spider we are actually studying. Why the Name Matters A scientific name is much more than a label attached to an animal. It connects that animal to everything we report about it, including its biology, distribution, behavior, venom, toxins, and even its potential medical importance. When a tarantula is incorrectly identified, or when an outdated name continues to be used without considering changes in taxonomy, the problem ca...

Inter-individual variability in equine antibody responses to African snake venoms follows heavy-tailed distributions with implications for antivenom production

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Inter-individual variability in equine antibody responses to African snake venoms follows heavy-tailed distributions with implications for antivenom production

Abstract

Variability in the antibody response of horses used for snake antivenom manufacture is well recognized, yet its statistical structure and implications for industrial productivity remain poorly characterized. In this study, we quantified antivenom antibody titers by ELISA in a cohort of 14 horses immunized with venoms from the clinically most important snakes in sub-Saharan Africa. To integrate antibody levels with plasma availability, we calculated the Cumulative Plasma Productivity (CPP) by converting individual plasma volumes into titer-corrected equivalents and sequentially pooling these volumes according to their corrected contribution. Distributional analysis revealed right-skewed, heavy-tailed patterns better approximated by a log-normal model than by a strict Pareto (power-law) form, with approximately 20–30% of horses accounting for nearly half of total cohort productivity. Excluding plasma from the lowest-productivity horses did not significantly improve the venom-neutralizing potency of the plasma pool in the mouse model but substantially reduced the total plasma volume. While the exact quantitative contributions may vary across cohorts, the qualitative conclusions are likely to be generalizable under similar experimental conditions.
Sánchez, A., Sánchez, P., Sánchez, A., Durán, G., Solano, G., Villalta, M., Gómez, A., Gutiérrez, J. M., & León, G. (2026). Inter-individual variability in equine antibody responses to African snake venoms follows heavy-tailed distributions with implications for antivenom production. Toxicon, 109145. https://doi.org/10.1016/j.toxicon.2026.109145