a retrospective case series study of alcaligenes faecalis pneumonia

Background: the potentially developing human pathogen alcaligenes faecalisis a gram-negative,nonfermenting bacterium. treatment of a. faecalisinfections is frequently difficult due to increased resistance to many antibiotics, such as β-lactam antibiotics, aminoglycosides, and quinolones. in the literature, a. faecalispneumonia has never been documented in a case series study. here, we provide a case series study of patients with a. faecalispneumonia. objectives: the aim of this study was to elucidate the clinical characteristics, management strategies, and outcomes of a. faecalispneumonia patients. methods: patients with a. faecalispneumonia between january 2014 and december 2019 were included in a retrospective investigation. we examined the clinical outcomes of patients with a. faecalispneumonia, together with the risk factors for pneumonia, prior intravenous antibiotic use within 90 days, respiratory secretion culture results, antibiotic sensitivity test results, and other variables. results: observations revealed eight patients with a. faecalispneumonia, including six males and two females. the mean age of patients was 70 years. these eight patients shared risk factors for pneumonia. six patients were discharged, and two patients died as a result of a. faecalispneumonia. two patients with pneumonia caused by extensively drug-resistant a. faecaliswere identified. conclusions: rare cases of a. faecalispneumonia have been documented in the literature. recently, a. faecalishas developed extensive drug resistance. to treat pneumonia caused by a. faecaliswith substantial antibiotic resistance, either polymyxin b or tigecycline is needed. the clinical outcome is typically satisfactory when a. faecalispneumonia patients receive appropriate antibiotic therapy, but cases of fatal pneumonia have been documented in the literature.