Faculty Bibliography

IMPORTANCE/UNASSIGNED:Trichophyton indotineae is an emerging dermatophyte causing outbreaks of extensive tinea infections often unresponsive to terbinafine. This species has been detected worldwide and in multiple US states, yet detailed US data on infections with T indotineae are sparse and could improve treatment practices and medical understanding of transmission. OBJECTIVE/UNASSIGNED:To correlate clinical features of T indotineae infections with in vitro antifungal susceptibility testing results, squalene epoxidase gene sequence variations, and isolate relatedness using whole-genome sequencing. DESIGN, SETTING, AND PARTICIPANTS/UNASSIGNED:This retrospective cohort study of patients with T indotineae infections in New York City spanned May 2022 to May 2023. Patients with confirmed T indotineae infections were recruited from 6 New York City medical centers. MAIN OUTCOME AND MEASURE/UNASSIGNED:Improvement or resolution at the last follow-up assessment. RESULTS/UNASSIGNED:Among 11 patients with T indotineae (6 male and 5 female patients; median [range] age, 39 [10-65] years), 2 were pregnant; 1 had lymphoma; and the remainder were immunocompetent. Nine patients reported previous travel to Bangladesh. All had widespread lesions with variable scale and inflammation, topical antifungal monotherapy failure, and diagnostic delays (range, 3-42 months). Terbinafine treatment failed in 7 patients at standard doses (250 mg daily) for prolonged duration; these patients also had isolates with amino acid substitutions at positions 393 (L393S) or 397 (F397L) in squalene epoxidase that correlated with elevated terbinafine minimum inhibitory concentrations of 0.5 μg/mL or higher. Patients who were treated with fluconazole and griseofulvin improved in 2 of 4 and 2 of 5 instances, respectively, without correlation between outcomes and antifungal minimum inhibitory concentrations. Furthermore, 5 of 7 patients treated with itraconazole cleared or had improvement at the last follow-up, and 2 of 7 were lost to follow-up or stopped treatment. Based on whole-genome sequencing analysis, US isolates formed a cluster distinct from Indian isolates. CONCLUSION AND RELEVANCE/UNASSIGNED:The results of this case series suggest that disease severity, diagnostic delays, and lack of response to typically used doses and durations of antifungals for tinea were common in this primarily immunocompetent patient cohort with T indotineae, consistent with published data. Itraconazole was generally effective, and the acquisition of infection was likely in Bangladesh.

The widespread adoption of glucagon-like peptide-1 (GLP-1) agonists in treating type 2 diabetes mellitus (T2DM) and obesity has sparked investigations into their impact on hair health, an area characterized by diverse conjectures. Some propose potential risks such as disrupted hair growth cycles or premature androgenetic alopecia (AGA), while others suggest benefits linked to improved insulin sensitivity and enhanced scalp blood circulation. However, despite these theoretical underpinnings, clinical evidence linking GLP-1 agonists to hair loss remains sparse. The necessity for vigilant patient monitoring and collaborative efforts cannot be overstressed in comprehensively addressing any potential consequences of GLP-1 agonist therapy on hair health as their use continues to expand.