isoenzyme testing for leishmania

[Thomas Craig]

I am looking for a laboratory to do some isoenzyme testing of animal
leishmania infections.  Which  stage  is prefered and  in which medium
should it be sent to the lab?  
        Thanks    Dr. Tom Craig
                         Dept Veterinary Pathobiology
                        Texas A&M University
                         College Station, Tx 
                          409 845-9191