Impact of a porcine epidemic diarrhea outbreak on swine productivity in Japan: a retrospective cohort study

YAMANE, Itsuro; YAMAZAKI, Hisanori; ISHIZEKI, Sayoko; WATANABE, Yugo; OKUMURA, Hanako; OKUBO, Mitsuharu; KURE, Katsumasa; HAYAKAWA, Yuiko; FURUKAWA, Makoto; OOI, Munetaka; MIZUKAMI, Yoshihiro; ITO, Mitsugu

In Japan, PED was first confirmed at one swine farm in 1982 [14] . In 1996, a large PED epidemic occurred in 102 affected herds, and 39,539 pigs died [10] . From 1997 to 2006, only sporadic cases of PED were reported (1-3 cases/ year), and no cases were reported from 2007 to 2012 [10] . On 1 October 2013, a new case of PED was reported in a herd located in Okinawa Prefecture. From December 2013 to February 2014, the first PED epidemic (0-25 cases/week) was reported, primarily involving herds located on the southern island of Japan. From March to June 2014, a more severe PED epidemic (5-100 cases/week) was reported among herds throughout Japan [10] . By the end of August, these two PED epidemics had affected 817 herds, detected in 38 prefectures [9] and caused serious economic damage to the swine industry, as in the United States.