MAP strain types based on short sequence repeat typing. In this graph MAP straintyping is based on sequencing of multilocus short-sequence-repeats (MLSSR). Six loci were selected due to their high genetic diversity. PCR amplification was carried out with extracted DNA for all isolates using the previously published primers for the six loci . Strain types were coded using an uninformative coding system, coding sequence types from 1 to 15. Strain diversity per farm is shown in this figure.