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Shi X, Qiu S, Ji L, Lu H, Wu S, Chen Q, Zou X, Hu Q, Feng T, Chen S, Cui W, Xu S, Jiang M, Cai R, Geng Y, Bai Q, Huang D, Liu P. Pathogenetic characterization of a Micrococcus luteus strain isolated from an infant. Front Pediatr 2023; 11:1303040. [PMID: 38188910 PMCID: PMC10770869 DOI: 10.3389/fped.2023.1303040] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/27/2023] [Accepted: 12/04/2023] [Indexed: 01/09/2024] Open
Abstract
Purpose To explore the clinical characteristics of Micrococcus luteus bloodstream infection in an infant and characterize the phenotype and genotype of the isolated strains, as well as seek suitable infection models for assessing virulence. Methods Clinical data was collected from an infant patient diagnosed with M. luteus bloodstream infection. Metagenomic sequencing was performed on the isolated blood sample. The strain was isolated and underwent mass spectrometry, biochemical tests, antibiotic susceptibility assays, and whole-genome sequencing. The Galleria mellonella infection model was used to assess M. luteus virulence. Results Patient responded poorly to cephalosporins, but recovered after Linezolid treatment. Metagenomic sequencing identified M. luteus as the predominant species in the sample, confirming infection. They were identified as M. luteus with a high confidence level of 98.99% using mass spectrometry. The strain showed positive results for Catalase, Oxidase, and Urea tests, and negative results for Mannose, Xylose, Lactose, Mannitol, Arginine, and Galactose tests, consistent with the biochemical profile of M. luteus reference standards. M. luteus susceptibility to 15 antibiotics was demonstrated and no resistance genes were detected. Predicted virulence genes, including clpB, were associated with metabolic pathways and the type VI secretion system. The infection model demonstrated dose-dependent survival rates. Conclusion The infant likely developed a bloodstream infection with M. luteus due to compromised immunity. Although the isolated strain is sensitive to cephalosporin antibiotics and has low pathogenicity in infection models, clinical treatment with cephalosporins was ineffective. Linezolid proved to be effective, providing valuable guidance for future clinical management of such rare infections.
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Affiliation(s)
- Xiaolu Shi
- Department of Public Health Laboratory Sciences, School of Public Health, Hengyang Medical School, University of South China, Hengyang, China
- Shenzhen Center for Disease Control and Prevention, Shenzhen, China
| | - Shuxiang Qiu
- Department of Public Health Laboratory Sciences, School of Public Health, Hengyang Medical School, University of South China, Hengyang, China
| | - Liyin Ji
- Shenzhen Center for Disease Control and Prevention, Shenzhen, China
| | - Huiqun Lu
- Department of Public Health Laboratory Sciences, School of Public Health, Hengyang Medical School, University of South China, Hengyang, China
| | - Shuang Wu
- Shenzhen Center for Disease Control and Prevention, Shenzhen, China
| | - Qiongcheng Chen
- Shenzhen Center for Disease Control and Prevention, Shenzhen, China
| | - Xuan Zou
- Shenzhen Center for Disease Control and Prevention, Shenzhen, China
| | - Qinghua Hu
- Department of Public Health Laboratory Sciences, School of Public Health, Hengyang Medical School, University of South China, Hengyang, China
- Shenzhen Center for Disease Control and Prevention, Shenzhen, China
- Shenzhen Research Center for Communicable Disease Control and Prevention, Chinese Academy of Medical Sciences, Shenzhen, China
| | - Tiejian Feng
- Shenzhen Center for Disease Control and Prevention, Shenzhen, China
| | - Shiting Chen
- School of Public Health, Shanxi Medical University, Taiyuan, China
| | - Wenkai Cui
- Department of Public Health Laboratory Sciences, School of Public Health, Hengyang Medical School, University of South China, Hengyang, China
| | - Shiqin Xu
- School of Public Health, Shanxi Medical University, Taiyuan, China
| | - Min Jiang
- Shenzhen Center for Disease Control and Prevention, Shenzhen, China
| | - Rui Cai
- Shenzhen Center for Disease Control and Prevention, Shenzhen, China
| | - Yijie Geng
- Shenzhen Center for Disease Control and Prevention, Shenzhen, China
| | - Qinqin Bai
- Department of Public Health Laboratory Sciences, School of Public Health, Hengyang Medical School, University of South China, Hengyang, China
| | - Dingjie Huang
- School of Public Health, Shanxi Medical University, Taiyuan, China
| | - Peihui Liu
- Pediatric Department, Shenzhen Maternity and Child Healthcare Hospital, Shenzhen, China
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Pedrosa J, Aymée L, Rodrigues JADC, Reis NF, Baptista ARDS, Lilenbaum W. Galleria mellonella as an alternative invertebrate biomodel to pathogenic Leptospira experimental infections. Vet Microbiol 2023; 277:109627. [PMID: 36543088 DOI: 10.1016/j.vetmic.2022.109627] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2022] [Revised: 11/23/2022] [Accepted: 12/04/2022] [Indexed: 12/13/2022]
Affiliation(s)
- Juliana Pedrosa
- Laboratory of Veterinary Bacteriology, Biomedical Institute, Fluminense Federal University, Niterói, Rio de Janeiro, Brazil
| | - Luiza Aymée
- Laboratory of Veterinary Bacteriology, Biomedical Institute, Fluminense Federal University, Niterói, Rio de Janeiro, Brazil
| | - Julia Andrade de Castro Rodrigues
- Center for Microrganisms' Investigation, Biomedical Institute, Department of Microbiology and Parasitology, Fluminense Federal University, Niterói, Rio de Janeiro, Brazil
| | - Nathália Faria Reis
- Center for Microrganisms' Investigation, Biomedical Institute, Department of Microbiology and Parasitology, Fluminense Federal University, Niterói, Rio de Janeiro, Brazil
| | - Andrea Regina de Souza Baptista
- Center for Microrganisms' Investigation, Biomedical Institute, Department of Microbiology and Parasitology, Fluminense Federal University, Niterói, Rio de Janeiro, Brazil
| | - Walter Lilenbaum
- Laboratory of Veterinary Bacteriology, Biomedical Institute, Fluminense Federal University, Niterói, Rio de Janeiro, Brazil.
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