Tehran University of Medical Sciences Iranian Journal of Parasitology 1735-7020 20 1 2025 02 27 153 157 EN Nader Shakib Azad Department of Pediatrics, School of Medicine, Bushehr University of Medical Sciences, Bushehr, Iran Mohsen Kalantari Research Center for Health Sciences, Institute of Health, Department of Medical Entomology and Vectors Control, Shiraz University of Medical Sciences, Shiraz, Iran Masoumeh Amin Research Center for Health Sciences, Institute of Health, Department of Medical Entomology and Vectors Control, Shiraz University of Medical Sciences, Shiraz, Iran Afshin Barazesh Department of Microbiology and Parasitology, School of Medicine, Bushehr University of Medical Sciences, Bushehr, Iran 2024 09 03 2025 02 06 Myiasis infection is caused by the invasion of flies' eggs and larvae into different tissues of the host's body. The rarest form is urogenital myiasis, which can occur even in men with a much lower probability than women, especially in tropical and subtropical regions. The case of this study is a 5-year-old boy from suburbs of Bushehr City, southern Iran who referred to the Pediatrics Department of Persian Gulf Hospital in Bushehr due to constant fever and significant weight loss. In urine evaluation, the presence of Chrysomya bezziana larvae was confirmed. The larvae of several species of myiasis-producing flies can attack the urinary-genital system of people and cause urogenital symptoms. Therefore, it is necessary to diagnose and accurately identify the species of larvae that cause myiasis in order to properly treat affected patients. https://ijpa.tums.ac.ir/index.php/ijpa/article/view/4353 https://ijpa.tums.ac.ir/index.php/ijpa/article/download/4353/1419