In vitro susceptibility profile of Brazilian Sporothrix brasiliensis isolates to amorolfine hydrochloride and itraconazole.

Sporothrix brasiliensis is the leading cause of feline sporotrichosis in Brazil, an emerging zoonosis. Itraconazole (ITZ) is the first-line therapy; however, therapeutic failures and reports of ITZ-resistant isolates emphasize the need for new therapeutic options. This study evaluated the in vitro susceptibility profile of 25 Brazilian S. brasiliensis isolates to amorolfine hydrochloride (AMR) and ITZ. AMR evidenced fungicidal activity in 76% and fungistatic activity in 24% of isolates. All isolates were susceptible to ITZ. These findings support AMR as a promising antifungal candidate against S. brasiliensis and highlight the importance of continued surveillance of ITZ susceptibility, especially in endemic regions of Brazil.