Yes, the Ridom spa server has a function that maps specific spa types to known MLST designations, and also the spa types that are commonly associated with different MLST's. There have been enough studies done now where authors have conducted both spa and MLST determination, to demonstrate that a specific MLST is populated by different but closely related spa types. Consequently, clusters of related spa types can generally be mapped to known MLST designations. The system breaks down somewhat when you have unusual spa types or  singlet MLSTs that do not belong to a clonal complex. Also, there are some cases where genome recombination has occurred, such as in ST239 and ST34. For example, ST239 maps to CC8 clonal complex but the spa types for ST239 resemble CC30 strains, due to recombination between ST8 and ST30. Here is a paper that will give you some details on recombination. 

Yes, the Ridom spa server has a function that maps specific spa types to known MLST designations, and also the spa types that are commonly associated with different MLST's. There have been enough studies done now where authors have conducted both spa and MLST determination, to demonstrate that a specific MLST is populated by different but closely related spa types. Consequently, clusters of related spa types can generally be mapped to known MLST designations. The system breaks down somewhat when you have unusual spa types or  singlet MLSTs that do not belong to a clonal complex. Also, there are some cases where genome recombination has occurred, such as in ST239 and ST34. For example, ST239 maps to CC8 clonal complex but the spa types for ST239 resemble CC30 strains, due to recombination between ST8 and ST30. Here is a paper that will give you some details on recombination. 

I agree with professor McGavin's answer and contribute with additional comments. Genes selected for MLST analysis encode primary metabolism enzymes, while spa is a typical virulence gene. Besides recombination, you should take into account that spa gene is subject to a higher selection pressure, thus higher genetic diversity should be expected from spa sequences than from those of MLST genes. MLST and spa-typing databases are not fully inclusive, so unusual spa-types and singletons in MLST may be difficult to correlate. I thing that as databases grow with more combined spa-types and MLST accesions correlations will become more evident. Here are additional useful papers on correlation of spa-typing and MLST.

Thanks a lot! Your advice save me a lot of time.

Best regards

Jan

Prof. you answered what i have been looking for