Candida auris surveillance in the Military Health System: a multidrug-resistant threat

Objective: To evaluate the potential sources and current screening strategies for the multidrug-resistant fungal pathogen Candida auris in the US Military Health System (MHS). Methods: Utilizing the Multidrug-Resistant Organism Repository and Surveillance Network (MRSN), 6 instances of C. auris colonization or infection were identified within the MHS in 2024. Relevant medical and social history, drug susceptibilities, and next-generation genetic sequencing were obtained from MRSN and the electronic medical record. Hospital screening protocols for C. auris were reviewed in the affected facilities. Results: One case of C. auris infection and 5 cases of C. auris colonization in 2024 were identified in the MHS. Only 1 case of colonization was likely related to international travel; 5 patients had no recent travel history before infection or colonization. One patient was an active duty service member. Prior hospitalizations and infections were the most common risk factors present in each case. Two isolates had antimicrobial susceptibilities analyzed, both of which suggested resistance to fluconazole. Two of the 3 facilities had C. auris screening protocols in place to screen select individuals with risk factors; however, only 1 of the 6 cases presented was identified through these screening protocols. No cases of nosocomial transmission were found. Conclusions: C. auris remains a formidable threat to the MHS, with 6 cases identified in 3 treatment facilities, with 2 isolates demonstrating resistance to azoles. Screening protocols should reflect the domestic and international threats of this pathogen.