Abstract
Pythium insidiosum is a zoosporic organism which causes pythiosis in humans and animals. This study aimed to report the paradoxical growth of Brazilian P. insidiosum strains when submitted to in vitro susceptibility tests with caspofungin. The growth at concentrations above the minimal inhibitory concentration (MIC) ranged from 16 to 128 μg/ml and it was observed in 50% of the isolates tested. This paradoxical growth in the presence of caspofungin has been observed with Candida and Aspergillus strains, however, the phenomenon involving oomycetes was described here for the first time.
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