Prevalence and Genetic Identification of Three Species in Pigs in Southeastern China.

Parasitic spp. can infect many classes of vertebrates including humans and pigs. and zoonotic have been identified in pigs, and swine are implicated as potential reservoirs for . However, the prevalence of spp. in pigs in southeastern China has not been reported. In this study, 668 fecal samples collected from 6 different regions in Fujian Province, southeastern China, were analyzed to identify three species by nested PCR and sequencing analysis. The overall prevalence of spp. was 55.4% (370/668; 95% CI 51.6% to 59.2%), and the infection rate of ST1 was the highest (302/668; 45.2%, 95% CI 41.4% to 49.0%), followed by ST3 (228/668; 34.1%, 95% CI 30.5% to 37.7%) and (87/668; 13.0%, 95% CI 10.5% to 15.6%). was not detected in any samples. Moreover, the coinfection rate of ST1 and ST3 was 25.1% (168/668; 95% CI 21.9% to 28.4%), the coinfection rate of ST1 and was 3.7% (25/668; 95% CI 2.3% to 5.2%), the coinfection rate of ST3 and was 0.3% (2/668), and the coinfection rate of ST1, ST3, and was 4.0% (27/668; 95% CI 2.5% to 5.5%). A representative sequence (MK347346) was identical to the sequence of (DQ286372). Two subtype-specific sequences (MK357717 and MK347347) were almost identical to the sequences of ST1 (FR686383) and ST3 (AJ566411), respectively. This is the first study to survey the occurrence and to conduct molecular identification of three species in southeastern China. This is the first report regarding mixed infections with , ST1, and ST3 in China. More research studies are needed to better understand the transmission and zoonotic potential of spp.