A phenomenon which is commonly observed in microbiology laboratories is the contamination of test tubes during the seeding of pathological material or microbial cultures from one culture medium to the other. This phenomenon should not surprise us, since the contaminating microbes always represent ubiquitous microbes of the Aspergillus, Penicillium, Alternaria species and other types of molds as well as species of different bacteria Staphylococci, etc.. It may sometimes occur and it is not altogether exceptional that in such a tube there may grow in addition to the dermatophytes which were seeded, colonies of other species of dermatophytes.
Trans. of Dermato-Venerologica (Rumania) v8 n1 p49-52 1963.