Anidulafungin is primarily used to treat which type of fungal infection?

Anidulafungin is an echinocandin antifungal agent that is primarily effective against Candida species, making it particularly useful in treating candidiasis. This type of infection can manifest in various forms, including superficial mucosal infections and systemic infections, such as candidemia. Echinocandins, like anidulafungin, work by inhibiting the synthesis of β-1,3-D-glucan, an essential component of the fungal cell wall, thereby exerting their antifungal effects.

While athlete's foot and ringworm are caused by dermatophyte fungi, their treatment typically involves antifungal agents such as terbinafine or griseofulvin, rather than echinocandins like anidulafungin. Aspergillosis, on the other hand, is caused by Aspergillus species and is generally treated with agents such as voriconazole or amphotericin B. Therefore, the specific action and efficacy of anidulafungin against Candida species confirm that candidiasis is the correct answer for the condition primarily treated by this medication.