Network diagram of the relationships between MAP-culture positive animals (study animals) and test locations. The number beside each study animal (red dot) indicates the year of birth. The number beside each farm (blue dot) refers to the number of animals on that farm that tested positive. Arrows indicate the direction of movement of study animals. Three reference groups (A, B, C) highlight movement trends in the network, including the movement of multiple positive animals from a single infected herd (A), a study (positive) animal moving through farms before testing positive and moving to a factory or knackery (B; grey and black dots, respectively), and imported animals testing positive in Irish herds(C).