Intoxicação espontânea por larvas de Perreyia flavipes (Pergidae) em suínos no estado de Santa Catarina

Abstract

RESUMO.-Descreve-se um surto de intoxicação espontânea por Perreyia flavipes em suínos. O surto ocorreu no final de maio de 2009, na cidade de Urubici, planalto serrano do Estado de Santa Catarina, Brasil. A propriedade tinha aproximadamente 50 animais criados extensivamente e desses 10 animais adoeceram. Esses suínos apresentavam anorexia, apatia, movimento constante de cabeça e bater de orelhas, dificuldade de caminhar, cambaleio, ranger de dentes e a agitação aumentava mediante ruídos e movimentos próximos. Na necropsia as alterações observadas foram a marcada evidenciação do padrão lobular hepático e a presença de larvas de P. flavipes misturadas ao conteúdo estomacal. Microscopicamente observou-se necrose de coagulação dos hepatócitos, com distribuição centrolobular a massiva que era acompanhada de congestão e hemorragia acentuada, restando uma ou duas camadas de hepatócitos com degeneração vacuolar na região portal. Os aspectos clínicos, epidemiológicos e as lesões caracterizaram hepatite tóxica por larvas de P. flavipes em suínos. TERMOS DE INDEXAÇÃO:Perreyia flavipes, Pergidae, bicho mata-porco, necrose hepática, suínos. INTRODUÇÃOPerreyia flavipes (bicho mata-porco, bicho-da-chuva, "sawfly", lagarta preta, ruga) são insetos semelhantes às vespas, pertencentes à ordem Hymenoptera e subordem Symphuta. A ingestão da fase larval desses insetos tem sido reportada como causa de necrose hepática aguda em bovinos (Dadswell et al. 1984) The study reports an outbreak of spontaneous poisoning by Perreyia flavipes in pigs. The outbreak occurred at the end of May 2009, in the municipality of Urubici, plateau of Santa Catarina, Brazil. The farm had about 50 pigs reared extensively and 10 animals got sick. The clinical signs were anorexia, apathy, constant movement of the head and hitting the ears, difficulty to walk and stagger, gnashing of teeth and agitation that increased with noise and movement nearby. At necropsy, pronounced hepatic lobular pattern and P. flavipes larvae mixed with the stomach content were observed. Microscopically, hepatocellular centrilobular to diffuse coagulation necrosis with severe congestion and hemorrhage was observed, with vacuolar degeneration in one or two layers of hepatocytes in the portal zones. Clinical signs, epidemiology and lesions in the pigs were characteristic of toxic hepatitis by larvae of P. flavipes.

Sawfly larval poisoning in cattle: Report on new outbreaks and brief review of the literature

“…Theses aspects of the outbreak reported here are remarkably similar to SLP reported in cattle from Australia caused by Lophyrotoma interrupta (Roberts 1932, Callow 1955, McKenzie et al 1985a, in sheep from Denmark caused by Arge Pullata (Thamsborg et al 1987), and in cattle and sheep from Uruguay and cattle (Soares et al 2008, Raymundo et al 2009), sheep ) and pigs (Jonck et al 2010) from Brazil caused by Perreyia ϔlavipes. Further evidences are the ϐinding of fragments of sawϐly larvae in the fore stomachs of necropsied calves and the reproduction of the disease by feeding ground P. ϔlavipes larvae collected from the site where the spontaneous outbreak occurred and feeding them to a susceptible calf.…”

“…SLP has been described in cattle (Tryon 1921, Roberts 1932, Callow 1955, McKenzie et al 1985a,b, Soares et al 2008, Raymundo et al 2009), sheep , Thamsborg et al 1987, and pigs (Jonck et al 2010) and there is one isolated report o SLP in a dog . It is a remarkable disease since the toxin is present in the larvae of the insects.…”

“…The sawϐly Perreyia ϔlavipes Konow, 1899 (Pergidae: Perreyiinae) also referred as Lophyroides ϔlavipes and Brachytoma ϔlavipes have been reported from Uruguay and Brazil as affecting cattle , Soares et al 2008, Raymundo et al 2009, sheep , and pigs (Jonck et al 2010). The disease was reproduced in cattle, sheep and pigs (Soares 1997, Soares et al 2001) and rabbits (Raymundo 2008).…”

“…These insects are commonly known as "sawϐly" because the female specimens bear a saw-toothed appendage on the abdomen with which they cut clefts in the leaves of trees for oviposition (Oelrichs 1982, McKenzie et al 1985b). SLP has been described in cattle (Callow 1955, Oelrlichs 1982, McKenzie et al 1985a,b, Dutra et al 1997, Soares et al 2008, Raymundo et al 2009), sheep (Thamsborg et al 1987 and pigs (Jonck et al 2010) and in a dog . Species of sawϐly are reportedly associated with livestock poisoning in Australia, Denmark and South America.…”

Perreyia flavipes larvae toxicity

“…Larvae have been linked to spontaneous poisoning and deaths in different species and countries including the following: larvae of Lophyrotoma interrupta (Pergidae) poisoning cattle and sheep in Australia (Da-dswell et al 1985, larvae of Arge pullata (Argidae) poisoning sheep and goats in Denmark (Thamsborg et al 1987), larvae of Perreyia lepida (Pergidae) suspected of poisoning pigs in Brazil (Camargo, 1955 ), and larvae of Perreyia ϔlavipes (Pergidae) poisoning cattle and sheep in Uruguay (Dutra 1997 as well as cattle (Raymundo et al . 2009, Soares et al 2008, sheep (Raymundo et al 2008) and pigs (Jonck et al 2010) in Brazil. Experimental intoxication by Perreyia ϔlavipes larva e has been conducted in pigs (Soares et al 2001), cattle and sheep (Dutra 1997).…”