Prevalência da infecção por Toxoplasma gondii em suínos abatidos no Estado do Paraná, Brasil

Abstract

ResumoObjetivou-se determinar a prevalência da toxoplasmose em suínos abatidos em frigoríficos com inspeção sanitária do Estado do Paraná. Do total de 114 abatedouros foram selecionados aleatoriamente 13 com média diária de abate de 30 ou mais animais, de acordo com cada mesorregião paranaense. Coletou-se 424 amostras de sangue no período de outubro de 2002 a janeiro de 2003. Os soros foram submetidos à pesquisa de anticorpos anti-T. gondii (IgG) pela imunofluorescência indireta e 17 (4,00%) foram positivos, considerando títulos ≥ 64. De acordo com as categorias zootécnicas, seis das 29 matrizes avaliadas (20,69%) e 11 dos 395 animais de terminação (2,60%) foram positivos.Tal diferença foi estatisticamente significativa (p=0,0004) e pode estar relacionada ao maior tempo de exposição das matrizes aos fatores de risco associados à toxoplasmose. Comparando-se este estudo a outros previamente realizados no Estado do Paraná, observou-se uma tendência de decréscimo da prevalência da toxoplasmose no rebanho suíno, provavelmente devido às melhorias sanitárias adotadas nos últimos 15 anos. Palavras-chave: Toxoplasma gondii, suíno, prevalência, imunofluorescência AbstractThe aim of this study was to verify toxoplasmosis's prevalence in swine from slaughterhouses with inspection service in Paraná State. 13 of the 114 abattoirs were randomized in accordance with each State region and with the minimum daily abate of 30 animals. 424 swine blood samples were collected from October 2002 to January 2003. The Indirect Immunofluorescence Test (IFAT) was realized to detect Toxoplasma gondii antibodies (IgG) and 17 (4,00%) were positive, considering titers ≥ 64. According to the animals categories, six from 29 sows (20,69%) and 11 from 395 finisher pigs (2,60%) were positives. This difference was significant (p=0,0004) and could be related with the sow's period of exposition to toxoplasmosis risk factors. Comparing this research to previous ones in Paraná State, we could see a tendency of decrease in the toxoplasmosis prevalence in pig farms, maybe related to the swine industry improvements in the last 15 years.

Occurrence of infection by Toxoplasma gondii in slaughtered swine in the northwestern region of Paraná, Brazil

“…The cities in which positive animals were found are listed in Figure 1. The findings of this study are in agreement with those of Carletti et al (2005), who showed 2.6% of positive animals among 395 animals evaluated from 13 slaughterhouses from various regions of Paraná. The authors also suggested decreased tendency of the prevalence of toxoplasmosis in this species due to the technological improvement of farms, with a lower prevalence among finishing animals, suggesting that the reduced length of stay of these animals on the farm has decreased the likelihood of infection by T. gondii.…”

Occurrence of anti-Toxoplasma gondii antibodies in cattle and pigs slaughtered, State of Rio de Janeiro

“…The serological titers found in the pigs (Table 1) suggest that chronic infection was present, and these observations were similar to those of Carletti et al (2005). The lack of statistically significant difference (c 2 = 1.01; p Yates = 0.31) in occurrences of infection due to T. gondii in relation to sex (Table 2) was also observed by Souza (1995), since both genders were exposed to the same risk factors.…”

“…After a free and informed consent statement was signed by the individuals with technical responsibility for the slaughterhouses, 459 blood samples were collected from cattle and 406 from pigs, and these were sent to the Toxoplasmosis Laboratory of IOC/Fiocruz for storage at -20 °C. For the IFAT, the samples underwent serial fourfold dilutions down to 1:4096, and samples with titers ≥ 64 were considered positive in cattle (DAGUER et al, 2004) and in pigs (CARLETTI et al, 2005).…”

Factors associated with seropositivity for anti-Toxoplasma gondiiantibodies in pregnant women of Londrina, Paraná, Brazil

“…It was also not significant in the study carried out by Avelino et al (2004). These contradictory results could be explained by the drastic reduction of the prevalence of toxoplasmosis in the swine population in the Northern region of PR, one of the most important species in the transmission of toxoplasmosis to the human population in Brazil (Vidotto et al 1990, Tsutsui et al 2003, Olbrich-Neto & Meira 2004, Carletti et al 2005, Dias et al 2005. This reduction likely occurred as a result of increased technology and sanitary improvements adopted on swine farms over the last 15 years.…”