Abstract
Background. Chickens serve as an intermediate host for Toxoplasma gondii and Neospora caninum; infection of free-range (FR) chickens with these organisms is a useful indicator of soil and environmental contamination with oocysts. A total of 700 FR chicken serum samples and 300 heart samples were collected from Henan province from March to July 2015. Antibodies to T. gondii were found in 18.86% (132/700) of the chickens by modified agglutination test (cut-off 1 : 25), while 23.14% (162/700) were positive for N. caninum by indirect fluorescent antibody test (cut-off 1 : 25). T. gondii DNA was detected in the myocardium digestion liquids of 4/25 (16%) FR chickens. The PCR results of N. caninum DNA from FR chicken myocardium digestion liquids (n = 25) were all negative. Attempts to isolate viable T. gondii were unsuccessful. The results showed that there were antibodies to T. gondii and N. caninum in FR chickens from Henan province. Accordingly, effective control of feces from cats and dogs and improved pets hygiene habits were needed. To the author's knowledge, this is the first report of the presence of N. caninum antibody in chickens from China.
Highlights
Chickens serve as an intermediate host for Toxoplasma gondii and Neospora caninum; infection of free-range (FR) chickens with these organisms is a useful indicator of soil and environmental contamination with oocysts
Investigation of T. gondii and N. caninum infection in the free-range (FR) chickens is a useful indicator for assessment of soil and environmental contamination with oocysts
Sera samples from 700 FR chickens were tested for antibodies to T. gondii using the modified agglutination test (MAT) [2]
Summary
Many studies have evaluated Toxoplasma gondii and Neospora caninum infections in birds worldwide, including chickens [1, 2]. Chickens contribute to the T. gondii and N. caninum life cycle by acting as intermediate hosts or mechanical vectors [3, 4]. Chickens are resistant to toxoplasmosis, and most T. gondii positive chickens remain asymptomatic. Investigation of T. gondii and N. caninum infection in the free-range (FR) chickens is a useful indicator for assessment of soil and environmental contamination with oocysts. Only two viable T. gondii have been isolated from chickens in China [6, 7]. Further studies to develop methods of isolating T. gondii from China are warranted. Few English papers have investigated the seroprevalence of T. gondii in birds from China. T. gondii infections in FR chickens from central China and to isolate T. gondii
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