T. rubrum made up 83% of isolates from the strain sample and 95% of isolates
from the nail sample; when both samples were combined, it
made up 88% of isolates. The remaining cultures were mainly
T. interdigitale, with S. brevicaulis also being identified on two
occasions. Of the two S. brevicaulis isolates found in the nail
sample, each was confirmed a posteriori as etiologic by means
of later studies on repeat specimens, and one was obtained
from a specimen also yielding T. rubrum