Abstract
Azole resistance in Aspergillus fumigatus isolates is increasingly reported in different nosologic contexts with variable prevalence in different countries. Mutations in the target of triazoles are widely described in azole-resistant clinical isolates. The recovery of mutated/resistant isolates is described either in patients undergoing long-term azole treatment or after inhalation of environmentally acquired resistant isolates. Acquisition in patients during azole therapy highlights the capacity of this fungus to adapt to its environment, but it has a low impact in terms of public health, as interhuman transmission of A. fumigatus is uncommon. Environmentally acquired resistant isolates may propagate and affect populations at risk. The use of triazoles as first-line therapy or prophylaxis could lead to selection of resistant isolates in patients, because most isolates harbor azole cross-resistance. Although mold-active triazoles have provided major progress in the prophylaxis and treatment of Aspergillus infection, the increase of azole resistance could question their use in humans.
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