Skip to main content

Table 1 Distribution of Italian farms of small ruminants according to the levels of surveillance sensitivity

From: A relevant long-term impact of the circulation of a potentially contaminated vaccine on the distribution of scrapie in Italy. Results from a retrospective cohort study

Global surveillance sensitivity level Level 1 Surveillance Sensitivity Level 2 Surveillance Sensitivity Number of farms
  (based on the number of regularly slaughtered animals) (based on the number of fallen stock animals)  
1 1 1 131 893
2 1 2 1157
3 1 3 585
4 2 1 2884
5 2 2 101
6 2 3 74
7 3 1 1862
8 3 2 75
9 3 3 90
  1. This distribution was used as external standard population to calculate the standardized incidence rates. For both variables, the classes were created on the basis of the distribution of number of farms (level 1: 75% of farms; level 2: 15% of farms; level 3: 10% of farms. Additionally, the farms where no regularly slaughtered or fallen stock animals had been tested were respectively included into level 1).