Likewise, enzymes such as hemolysins, catalases or ureases, which are also involved in the mitigation of the immune response and whose functions for M. canis are inferred from what has been observed in other pathogens (dermatophytes and non-dermatophytes) [1,2,40], remain unknown in terms of their conditions of production and involvement in the process of infection. This evidence concerns the gene CAT and infection.