An Update on the Roles of Non-albicans Candida Species in Vulvovaginitis

<i>Candida</i> species are one of the commonest causes of vaginitis in healthy women of reproductive age. Vulvovaginal candidiasis (VVC) is characterized by vulvovaginal itching, redness and discharge. <i>Candida albicans</i>, which is a common genito-urinary tract commensal, has been the prominent species and remains the most common fungal agent isolated from clinical samples of patients diagnosed with VVC. In recent times, however, there has been a notable shift in the etiology of candidiasis with non-<i>albicans Candida</i> (NAC) species gaining prominence. The NAC species now account for approximately 10% to as high as 45% of VVC cases in some studies. This is associated with treatment challenges and a slightly different clinical picture. NAC species vaginitis is milder in presentation, often occur in patients with underlying chronic medical conditions and symptoms tend to be more recurrent or chronic compared with <i>C. albicans</i> vaginitis. <i>C. glabrata</i> is the most common cause of NAC-VVC. <i>C. tropicalis</i>, <i>C. krusei</i>, <i>C. parapsilosis</i>, and <i>C. guilliermondii</i> are the other commonly implicated species. Treatment failure is common in NAC-VVC, since some of these species are intrinsically resistant or show low susceptibilities to commonly used antifungal agents. This article reviews the etiology, pathogenesis, clinical features, diagnosis, and management of NAC vulvovaginitis.