FIG. 1.

Photo of S. aureus morphotypes from biliary culture. Isolates of S. aureus isolate 1 (MRSA) appear as classical large colonies that are yellow-white and domed with a zone of beta-hemolysis. The smaller colonies were identified as VISA. S. aureus isolate 2a (VISA) appears as a small yellow-white colony with a narrow zone of beta-hemolysis. S. aureus isolate 2b (VISA) appears as a pinpoint grey-white colony with a barely detectable zone of beta-hemolysis. Both isolate 2a and isolate 2b were domed and distinct.