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DK, duck; CK, chicken; DM, domestic mallard; WBM, wild bird mallard; WB, wild bird; JB, Jeonbuk; JN, Jeonnam; CB, Chungbuk; CN, Chungnam; GG, Gyeinggi; GN, Gyeongnam; JJ, Jeju; SU, Seoul; F, feces; OP, oropharayngeal swab; CL, cloacal swab.
