Epidemiology and vaccine of porcine epidemic diarrhea virus in China: a mini-review

SUN, Dongbo; WANG, Xinyu; WEI, Shan; CHEN, Jianfei; FENG, Li

Since 1966, the occurrence of pig diarrheal disease has been recorded in China. The disease showed a local endemic tendency with significant seasonal variations, usually occurring from the end of October to early February, and PEDV was confirmed to be the cause of such outbreaks in 1984 [43] . After PEDV infections in the pig population were confirmed, a series of investigations of PED occurrence were conducted in China. Ji et al. (1987) reported that in farms with PEDV outbreaks, the PEDV incidence was 80% in sows, 100% in suckling pigs and 90% in fattening pigs [18] . Wang et al. (1989) reported that among cases of PED in 1989, the PEDV incidence was 95% in fattening pigs, 60.4% in sows, 78.95% in boars and 100% in suckling pigs (with a mortality rate of 87.9%) [39] . These data suggest that PEDV infections were present in the pig population in China during PED occurred in Europe. However, before 2010, PEDV infections were mostly sporadic or locally endemic, with no large-scale outbreaks in China.