Stray dogs as indicators of <it>Toxoplasma gondii </it>distributed in the environment: the first report across an urban-rural gradient in China oleh Yan Chao, Fu Lin-Lin, Yue Cai-Ling, Tang Ren-Xian, Liu Yi-Sheng, Lv Liang, Shi Na, Zeng Ping, Zhang Peng, Wang Dong-Hui, Zhou Dong-Hui, Zhu Xing-Quan, Zheng Kui-Yang