Figure 5
Serosurvey of pig herds in Northern Italy. Graphs compare seroprevalence percentage obtained during serosurvey of swine farms of Lombardy and Emilia-Romagna in 2016 with data of 2010 and 2000. Farms were considered as positive (black) if percentage of seropositive sera was higher than 10% and negative with lower percentage of seropositivity. Negatives include farms with seroprevalence equal to 0 (white) and with seroprevalence lower than 10% (dotted). (A) total of farms considered.(B) herds divided between Fattening and Breeding. Only 2016 and 2010 data considered. Differences between data were statistically validated with one-sided Fisher’s exact test and p value obtained for every couples compared was lower than 0.001. *, in 200029, serosurvey divided farms by seroprevalence percentage in four groups: neg, < 5%, 5–15%, > 15%. All farms with seroprevalence lower than 15% were considered as “negative with seroprevalence” (dotted).
