Fig. 4From: Efficacy of genogroup 1 based porcine epidemic diarrhea live vaccine against genogroup 2 field strain in JapanThe mortality rate of suckling piglets by age in weeks at field farms with PED. Weeks are indicated as follows: 0 = the mortality rate of piglets born in the week of PED outbreak, − 1, − 2 or − 3 = the mortality rate of piglets in 1, 2, or 3 weeks of age at the week of PED outbreak, respectively, 1 or 2 = the mortality rate of piglets born in the next weeks of PED outbreak. Different letters indicate significant differences among farms (P < 0.01)Back to article page