Aspergillus species are rapidly growing molds with branching septate hyphae and char-acteristic arrangement of conidia on the conidiophore (Fig 48–4A). Fluffy colonies ap-pear in 1 to 2 days and, by 5 days, may cover an entire plate with pigmented growth. Species are defined on the basis of differences in the structure of the conidiophore and the arrangement of the conidia. The most frequent in human infections are Aspergillus fu-migatus and Aspergillus flavus, but others, such as Aspergillus niger, may be involved.
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