Effectiveness and costs of interventions to reduce the within-farm Toxoplasma gondii seroprevalence on pig farms in the Netherlands

Table 1 Farm characteristics and study data of the five pig farms participating in the intervention study

Farm #	Farm type	Farm size (# finishing pigs)	Farm system	Start date of intervention strategy	# Blood samples before intervention (positive; total; %)	# Blood samples after intervention (positive; total; %)
1	Finisher	3333	Conventional	25 Aug. 2017	138 ; 278 ; 50	65 ; 320 ; 20
2	Breeder-Finisher	600	Organic	15 Nov. 2017	16 ; 150 ; 11	1 ; 126 ; 1
3	Finisher	200	Organic	28 Dec. 2017	6 ; 83 ; 7^a	4 ; 96 ; 4
4	Finisher	100	Organic	1 Dec. 2017	6 ; 48 ; 13	2 ; 24 ; 8
5	Finisher	350	Conventional	1 Mar. 2018	12 ; 71 ; 17	6 ; 47 ; 13

^aDue to the fact that the date of selection and the start date of the actual intervention strategy differed the estimated with-in farm seroprevalence turned out to be < 10 % for one farm in the year before the start of the implementation of the intervention strategy

ISSN: 2055-5660