Figure 6

Percentage of PRRSV positive swabs obtained from infected sentinel pigs during the experiment. Oral, rectal and nasal swabs were obtained from sentinel pigs every three days. Swabs from sentinel pigs considered to be infected (based on the determination of viremia in the same days or in previous days) were used for virus isolation. The percentage of positive swabs obtained from infected pigs in each experimental group each sampling day is represented in the figure.