Figure 1
swIAV infection states for breeding sows and growing pigs. S: susceptible animals; I 1 and I 2: Infected animals by subtype 1 or subtype 2, respectively; I 1-2 and I 2-1: co-infected animals, Y 1 and Y 2: animals infected by subtype 1 or 2 while recovered from subtype 2 or 1, respectively; R 1 and R 2: animals recovered from subtype 1 or 2, respectively; R 1-2: animals recovered to both subtypes; M: animals with maternally-derived antibodies; V: vaccinated animals; I V1 and I V2 : animals infected by subtype 1 or 2 while vaccinated. Arrows represent the transitions between the classes. Dashed lines are specific to breeding sows. Dotted lines are specific to growing pigs. Solid lines are common to sows and growing pigs. Parameters involved in the transitions are summarized in Table 2.