Agar dilution - comparing amphotericin B and itraconazole

Six isolates of A.fumigatus, of which one (AF72) is documented to be itraconazole resistant. On the left is the control plate, showing good growth at 48 hr on Sabouraud dextrose agar. The next three pairs of plates contain increasing and equal concentrations of amphotericin B (top row) and itraconazole (bottom row). AF72 is a slowly growing isolate that is not inhibited by any concentration of either drug, AF11 is fully susceptible to itraconazole (