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Background  The parasite  Toxoplasma gondii (T. gondii)  is recognized as one of the major foodborne pathogens with a high human disease burden. To control  T. gondii  infections in pigs, European Food Safety Agency (EFSA) advises serological testing of pigs and audits of pig farms to identify risk factors for  T. gondii  infection. In line with this approach, the aim of the current study was to assess the effectiveness and costs of intervention measures implemented to reduce the  T. gondii  seroprevalence on finishing pig farms in the Netherlands. A crossover clinical trial was conducted at five case farms were their own control and the cross-over moment was the implementation of interventions to reduce risk factors. Each of the case farms had a farm-specific intervention strategy with one principal intervention measure (neutering of cats, professional rodent control or covering food storage).    Results  All finishing pig farms ( n  = 5) showed a reduction in  T. gondii  seroprevalence within one year of implementing the intervention strategy. Cat neutering ( n  = 3) and feed coverage ( n  = 1) showed statistically significant reductions in seroprevalence. Rodent control ( n  = 1) did not show a statistically significant reduction. The estimated reduction in seroprevalence in response to the neutering of cats and feed coverage were 67 and 96 %, respectively.    Conclusions  Our work demonstrates that it is possible to reduce the within-farm  T. gondii  seroprevalence within one year after interventions were implemented to reduce  T. gondii  risk factors. This information is essential and encouraging for policy makers, food business operators, and farmers to implement in their risk assessment and to apply to food safety control systems.    Supplementary Information  The online version contains supplementary material available at 10.1186/s40813-021-00223-0.

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