Spontaneous intoxication of sheep by the pollen beetle Astylus atromaculatus : 4 outbreaks in Uruguay and Argentina.

Autor:	Matto C; Ministerio de Ganadería, Agricultura y Pesca (MGAP), DILAVE 'Miguel C. Rubino,' Laboratorio Regional Noroeste, Treinta y Tres, Uruguay., García JA; Instituto de Innovación para la Producción Agropecuaria y el Desarrollo Sostenible (IPADS) Balcarce, Buenos Aires, Argentina., Livio JM; Instituto de Innovación para la Producción Agropecuaria y el Desarrollo Sostenible (IPADS) Balcarce, Buenos Aires, Argentina., Rodríguez V; Ministerio de Ganadería, Agricultura y Pesca (MGAP), DILAVE 'Miguel C. Rubino,' Laboratorio Regional Noroeste, Treinta y Tres, Uruguay., Gianneechini E; Ministerio de Ganadería, Agricultura y Pesca (MGAP), DILAVE 'Miguel C. Rubino,' Laboratorio Regional Noroeste, Treinta y Tres, Uruguay., Giannitti F; Instituto Nacional de Investigación Agropecuaria (INIA), Plataforma de Investigación en Salud Animal, Estación Experimental La Estanzuela, Colonia, Uruguay., García Y Santos C; Universidad de la República, Facultad de Veterinaria, Departamento de Toxicología, Montevideo, Uruguay., Corro AC; Universidad de la República, Facultad de Veterinaria, Departamento de Toxicología, Montevideo, Uruguay., Dutra F; Paysandú, and Laboratorio Regional Este, Treinta y Tres, Uruguay., Uzal FA; California Animal Health and Food Safety Laboratory, San Bernardino Branch, School of Veterinary Medicine, University of California-Davis, CA, USA.
Jazyk:	angličtina
Zdroj:	Journal of veterinary diagnostic investigation : official publication of the American Association of Veterinary Laboratory Diagnosticians, Inc [J Vet Diagn Invest] 2024 Jul; Vol. 36 (4), pp. 573-578. Date of Electronic Publication: 2024 May 06.
DOI:	10.1177/10406387241249180
Abstrakt:	Astylus atromaculatus Blanchard is a native beetle of South America that feeds on pollen. During the summer of 2022-2023 in Argentina and Uruguay, an explosive infestation of these insects occurred in pastures in which ruminants were grazing. This was believed to be associated with a severe drought, which had significantly reduced the flowering of crops. Three farms in Uruguay and one in Argentina were visited to examine the flocks and perform autopsies. Affected sheep had watery diarrhea, anorexia, depression, and ruminal atony. The average morbidity, mortality, and case fatality rates were 7.5%, 4.3%, and 68%, respectively. The main gross findings in all animals were in the jejunum; the serosa had multifocal hemorrhages, and the mucosa was necrotic and covered by a pseudomembrane. Microscopically, the mucosa had partial-to-complete necrosis of the lamina propria, as well as loss of villus and crypt epithelium with neutrophilic infiltration. Overlying the necrotic mucosa was a pseudomembrane of fibrin, cell debris, desquamated epithelial cells, degenerate neutrophils, and bacteria. Many specimens of A. atromaculatus were in all paddocks in which sheep grazed, as well as in the ruminal content of the autopsied animals. Competing Interests: Declaration of conflicting interestsThe authors declared no potential conflicts of interests with respect to concerning the research, authorship, and/or publication of this article.
Databáze:	MEDLINE
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