The objectives of the study were to estimate the prevalence of anti-Toxoplasma gondii antibodies in free-range chickens in Aguascalientes, Mexico, its association with certain risk factors, and the frequency of parasite DNA in the heart. Eighty-one small rural family farms were included, and blood and heart samples were taken from 150 clinically healthy, adult, free-range chickens. Serum samples were processed by indirect immunofluorescence antibody test considering a dilution of 1:16 as a positive reaction, while the DNA detection was done by PCR. The correlation between the presence of antibodies and the potential risk factors was estimated with logistic regression. The overall seroprevalence in the examined populations was 67%, with a range from 33% to 100% among municipalities, and 78% of the farms having at least one seropositive bird. The PCR test identified the presence of parasite DNA for one case only. Among the variables, the presence of cats and the presence of other animal species on the farm were the ones that had the highest values, while the presence of feral cats and the presence of noxious fauna were also identified as potential risk factors. The results indicate high soil contamination by T. gondii oocysts, which implies the active role of cats living on the farms.
Alvarado-Esquivel, C., González-Salazar, A., Alvarado-Esquivel, D., Ontiveros-Vázquez, F., Vitela-Corrales, J., Villena, I. and Dubey, J. P. (2012): Seroprevalence of Toxoplasma gondii infection in chickens in Durango state, Mexico. J. Parasitol. 98 ,431–432.
Bawm, S., Maung, W. Y., Win, M. Y., Thu, M. J., Chel, H. M., Khaing, T. A., Wai, S. S., Htun, L. L., Myaing, T. T., Tiwananthagorn, S., Igarashi, M. and Katakura, K. (2016): Serological survey and factors associated with Toxoplasma gondii infection in domestic goats in Myanmar. Scientifica (Cairo) 2016 ,4794318.
Braz, B. M. A., Feitosa, B. C. O., Romão, E. A., Silva, E. M., Pinheiro Júnior, J. W, Mota, R. A., Azevedo, S. S. and Porto, W. J. (2020): Cross-sectional survey for toxoplasmosis in free-range chickens (Gallus gallus domesticus) from the Atlantic Forest area in Alagoas state, Northeastern Brazil. Braz. J. Vet. Parasitol. 29 ,e014120.
Dubey, J. P. (2010): Toxoplasma gondii infections in chickens (Gallus domesticus): prevalence, clinical disease, diagnosis and public health significance. Zoonoses Public Hlth. 57 ,60–73.
Dubey, J. P. (2021): Toxoplasmosis of Animals and Humans. 3rd ed. CRC Press. pp. 17–25, 33–47, 181.
Dubey, J., Morales, E. and Lehmann, T. (2004): Isolation and genotyping of Toxoplasma gondii from free-ranging chickens from Mexico. J. Parasitol. 90 ,411–413.
Dubey, J. P., Pena, H. F. J., Cerqueira-Cézar, C. K., Murata, F. H. A., Kwok, O. C. H., Yang, Y. R., Gennari, S. M. and Su, C. (2020): Epidemiologic significance of Toxoplasma gondii infections in chickens (Gallus domesticus): the past decade. Parasitology 147 ,1263–1289.
Feng, Y., Lu, Y., Wang, Y., Lui, J., Zhang, L. and Yang, Y. (2016): Toxoplasma gondii and Neospora caninum in free-range chickens in Henan Province of China. Biomed. Res. Int. 8290536.
Geuthner, A., Koethe, M., Ludewig, M., Pott, S., Schares, G., Maksimov, P., Daugschies, A. and Bangoura, B. (2019): Development of an in vivo model for Toxoplasma gondii infections in chickens and turkeys simulating natural routes of infection. Vet. Parasitol. 276 ,108956.
Gilot-Fromont, E., Lélu, M., Dardé, M., Richomme, C., Aubert, D., Afonso, E., Mercier, A., Gotteland, C. and Villena, I. (2012): The life cycle of Toxoplasma gondii in the natural environment. In: Djurković-Djaković, O. (ed.) Toxoplasmosis – Recent Advances. IntechOpen, London, UK. pp. 3–36.
Homan, W. L., Vercammen, M., De Braekeleer, J. and Verschueren, H. (2000): Identification of a 200- to 300-fold repetitive 529 bp DNA fragment in Toxoplasma gondii, and its use for diagnostic and quantitative PCR. Int. J. Parasitol. 30 ,69–75.
Jones, J. L. and Dubey, J. P. (2012): Foodborne toxoplasmosis. Clin. Infect. Dis. 55 ,845–851.
Minutti, A. F., Vieira, G. F. E., Sasse, J. S., Martins, T. A., de Seixas, M., Cardim, S. T., de Barros, L. D. and Garcia, J. L. (2021): Comparison of serological and molecular techniques to detect Toxoplasma gondii in free-range chickens (Gallus gallus domesticus). Vet. Parasitol. 296 ,109515.
Nie, L. B., Gong, Q. L., Wang, Q., Zhang, R., Shi, J. F., Yang, Y., Li, J. M., Zhu, X. Q., Shi, K. and Du, R. (2022): Prevalence of Toxoplasma gondii infection in chickens in China during 1993–2021: a systematic review and meta-analysis. Parasitol. Res. 121 ,287–301.
Reischl, U., Bretagne, S., Kruger, D., Ernault, P. and Costa, J. M. (2003): Comparison of two DNA targets for the diagnosis of toxoplasmosis by real-time PCR using fluorescence resonance energy transfer hybridization probes. BMC Infect. Dis. 3 ,7.
Schares, G., Bangoura, B., Randau, F., Goroll, T., Ludewig, M., Maksimov, P., Matzkeit, B., Sens, M., Bärwald, A., Conraths, F. J., Opsteegh, M. and Van der Giessen, J. (2017): High seroprevalence of Toxoplasma gondii and probability of detecting tissue cysts in backyard laying hens compared with hens from large free-range farms. Int. J. Parasitol. 47 ,765–777.
Shapiro, K., Bahia-Oliveira, L., Dixon, B., Dumètre, A., de Wit, L., VanWormer, E. and Villena, I. (2019): Environmental transmission of Toxoplasma gondii: oocysts in water, soil and food. Food Waterborne Parasitol. 15 ,e00049.
Stelzer, S., Basso, W., Benavides Silván, J., Ortega-Mora, L., Maksimov, P., Gethmann, J., Conraths, F. J. and Schares, G. (2019): Toxoplasma gondii infection and toxoplasmosis in farm animals: risk factors and economic impact. Food Waterborne Parasitol. 12 ,e00037.