人类蝼蛆病是由不同家蝇科的幼虫引起的疾病。它主要发生在卫生条件差、经济地位低下的社区。与此同时，医院内感染的蝼蛆病是罕见的现象，但与公共卫生有关。在此，我们报告了2021年6月和7月墨西哥科利马州立大学医院内科服务的五名患有不同疾病的患者中，由短管扁蝇（Cochliomyia macellaria）引起的一起蝼蛆病暴发事件。其中三名患者为男性，两名为女性，年龄为37至83岁。所有人都患上了由短管扁蝇幼虫引起的蝼蛆病。三名患者接受了侵入性机械通气；一名患有皮肤基底细胞癌，一名患有进展期糖尿病足病。此事件发生在住院4天后，在同一医院的病区。两名患者死亡，其余的在经过抗生素和伊维菌素治疗后出院。我们认为这个医院内的疫情集群比热带国家报道的更为频繁，当局应该及时发现并予以重视，特别是对弱势群体。

Myiasis in humans is a disease caused by larvae of various fly families. It mainly occurs in communities with poor sanitation and low socioeconomic status. Meanwhile intrahospital or nosocomial myiasis represents a rare phenomenon but is of relevance to public health. Here, we report an outbreak of myiasis caused by Cochliomyia macellaria in five patients hospitalized for several diseases at the Service of Internal Medicine of the Hospital Regional Universitario de Colima, Mexico during June and July 2021. Three patients were males and two were females, aged 37 to 83 years. All were affected by myiasis caused by larvae of the fly C. macellaria. Three patients underwent invasive mechanical ventilation; one had cutaneous basal cell cancer and one had advanced diabetic foot. This event occurred after 4 days of hospitalization and in the same hospital pavilion. Two patients died, and the others were discharged after treatment with antibiotics and ivermectin. We believe that this nosocomial cluster represents a more frequent phenomenon than reported in tropical countries, where authorities should pay attention to its timely detection, especially in vulnerable populations.