Fig. 2
From: High prevalence of hepatitis E virus infection among domestic pigs in Ibaraki Prefecture, Japan
Anti-HEV IgG and IgM antibody titers and the age of breeding sows. The vertical axis shows the optical density of the anti-HEV IgG antibody titer, whereas the horizontal axis shows the age (in months) of the breeding sows in the form of a scattergram. The red triangles indicate positive IgG and IgM, yellow squares indicate positive IgG, and blue circles indicate negative IgG pigs. IgM antibody titers were noted individually