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Background   Mycobacterium avium  subspecies  paratuberculosis  ( Map ) causes an infectious chronic enteritis (paratuberculosis or Johne's disease) principally of ruminants. The epidemiology of  Map  is poorly understood, particularly with respect to the role of wildlife reservoirs and the controversial issue of zoonotic potential (Crohn's disease). Genotypic discrimination of  Map  isolates is pivotal to descriptive epidemiology and resolving these issues. This study was undertaken to determine the genetic diversity of  Map , enhance our understanding of the host range and distribution and assess the potential for interspecies transmission.    Results  164  Map  isolates from seven European countries representing 19 different host species were genotyped by standardized IS 900  - restriction fragment length polymorphism (IS 900 -RFLP), pulsed-field gel electrophoresis (PFGE), amplified fragment length polymorphisms (AFLP) and mycobacterial interspersed repeat unit-variable number tandem repeat (MIRU-VNTR) analyses. Six PstI and 17 BstEII IS 900 -RFLP, 31 multiplex [SnaBI-SpeI] PFGE profiles and 23 MIRU-VNTR profiles were detected. AFLP gave insufficient discrimination of isolates for meaningful genetic analysis. Point estimates for Simpson's index of diversity calculated for the individual typing techniques were in the range of 0.636 to 0.664 but a combination of all three methods increased the discriminating power to 0.879, sufficient for investigating transmission dynamics. Two predominant strain types were detected across Europe with all three typing techniques. Evidence for interspecies transmission between wildlife and domestic ruminants on the same property was demonstrated in four cases, between wildlife species on the same property in two cases and between different species of domestic livestock on one property.    Conclusion  The results of this study showed that it is necessary to use multiple genotyping techniques targeting different sources of genetic variation to obtain the level of discrimination necessary to investigate transmission dynamics and trace the source of  Map  infections. Furthermore, the combination of genotyping techniques may depend on the geographical location of the population to be tested. Identical genotypes were obtained from  Map  isolated from different host species co-habiting on the same property strongly suggesting that interspecies transmission occurs. Interspecies transmission of  Map  between wildlife species and domestic livestock on the same property provides further evidence to support a role for wildlife reservoirs of infection.

bmc microbiology

Occurrence of Mycobacterium avium subspecies paratuberculosis across host species and European countries with evidence for transmission between wildlife and domestic ruminants