 Clonal relatedness among isolates of the same species will be investigated by high-throughput genotyping techniques such as RAPD Random Amplified Polymorphic DNA andor by AFLP Amplified Fragment Length Polymorphism analysis andor REP PCR 19-21. In selected isolates, the clonal relationships will be performed by macrorestriction analysis of genomic DNA by pulsed-field gel electrophoresis PFGE. 