RESEARCH ARTICLE Co-Circulation of Canine Coronavirus I and IIa/b with High Prevalence and Genetic Diversity in Heilongjiang Province, Northeast China Xinyu Wang1, Chunqiu Li1, Donghua Guo1, Xinyu Wang1, Shan Wei1, Yufei Geng1, Enyu Wang1, Zhihui Wang1, Xiwen Zhao1, Mingjun Su1, Qiujin Liu1, Siyao Zhang1, Li Feng2, Dongbo Sun1* 1 College of Animal Science and Veterinary Medicine, Heilongjiang Bayi Agricultural University, No. 5 Xinfeng Road, Sartu District, Daqing 163319, P.R. China, 2 National Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute of the Chinese Academy of Agricultural Sciences, No. 427 Maduan Street, Nangang District, Harbin 150001, P.R. China *