Journal
WILDERNESS & ENVIRONMENTAL MEDICINE
Volume 21, Issue 4, Pages 282-290Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.wem.2010.06.008
Keywords
scorpionism; Tityus; Tityus breweri; scorpion venom; scorpion toxin; Guayana; Venezuela
Funding
- Consejo de Investigacion, Universidad de Oriente [CI-3-040602-1342/07, CI-2-010101-1275/06]
- Fonacit [2001000672, PI-2004000385]
- Conservacion Internacional Venezuela
- Compania Aurifera Brisas del Cuyuni C.A.
- Fundacion La Salle de Ciencias Naturales
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Objectives.-Scorpion envenomation is a common public health problem in Venezuela. We report an envenoming case by Tityus breweri, endemic to the Guayana Shield, southeast Venezuela, and the outcome of its treatment with antivenom anti-Tityus discrepans. Toxin composition and antigenic reactivity of T breweri venom were also explored. T breweri distribution range was re-evaluated. Methods.-Clinical signs and symptoms in an adult male were recorded after envenoming and treatment with antivenom. Toxin composition and antigenicity of T breweri venom were investigated by polyacrylamide gel electrophoresis, immunoblotting, and mass spectrometry. T breweri distribution range was reassessed by mapping new records of the species. Results.-The moderately severe case (a 21-year-old man) presented autonomic manifestations, including cardiopulmonary and gastrointestinal effects. Full recovery was achieved after anti T discrepans antivenom administration. T breweri venom contains toxins in the 6-8 kd range that affect voltage-sensitive sodium channels. Based on new records, T breweri distribution area reaches 12 155 km.(2) Inclusion of southeast Venezuela as an endemic area of scorpionism prompted the examination of clinical, immunological, and phylogenetic evidence for suggesting a partitioning of the Venezuelan Tityus fauna into toxinological provinces. Conclusions.-The severity of the case reinforces categorization of the Guayana Shield region as a macroendemic area of scorpionism in Venezuela and allows classification of T breweri as a species of medical importance, with toxins immunologically related to central-eastern Venezuelan Tityus. Partitioning of the territory incorporating multiple criteria may help health authorities establish and implement preventive and therapeutic measures for scorpion envenoming in this region.
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