Clinical and genomic analysis of virulence-related genes in bloodstream infections caused by Acinetobacter baumannii

Bai, Bing1,2,3; Eales, Brianna M.3; Huang, Wei4; Ledesma, Kimberly R.3; Merlau, Paul R.3; Li, Guiqiu1,2; Yu, Zhijian1,2,3; Tam, Vincent H.3

2022-12-31

10.1080/21505594.2022.2132053

Virulence   Impact Factor & Quartile

2150-5594

2150-5608

Acinetobacter baumannii has emerged as a common cause of bloodstream infections, which is associated with high mortality and long periods of hospitalization. To advance the medical care of our patients, the study was designed to identify microbial characteristics associated with poor clinical outcomes. A collection of 32 A. baumannii bloodstream isolates with diverse genetic backgrounds (as determined by multilocus sequence typing) was studied. These isolates were recovered by unique patients (18 males, 14 females; age range: 17 days to 87 years) between 2011 and 2018. A sequential screening approach (cross-referencing analyses using different endpoints) was used to identify isolates with the best correlation between bacterial virulence and clinical prognosis. Isolates associated with more rapid in vitro growth rate, shorter median survival time in pre-clinical infection models, and hospital mortality were selected as candidates for high virulence, while those with opposite characteristics were selected as controls with low virulence. Whole genome sequencing was undertaken in the most promising clinical isolates. We found five virulence genes (beta-hemolysin/cytolysin, Cpi-1a + Cpi-1 (SPI-1 like), enhanced entry proteins, FbpABC, Paa) and 1 secretory system (T6SS) only present in a highly virulent isolate (AB23), compared to a low virulence control isolate (AB6). These genetic elements could be associated with the poor prognosis of A. baumannii bacteraemia and further investigations are warranted.

Gram-negative bacteria bacteraemia whole genome sequencing outcome

SCI

English

Others

National Institutes of Health[5R01AI140287-04]

Immunology ; Infectious Diseases ; Microbiology

Immunology ; Infectious Diseases ; Microbiology

WOS:000876245000001

TAYLOR & FRANCIS INC

Web of Science

1.Shenzhen Univ, Affiliated Hosp 6, Hlth Ctr, Dept Infect Dis, Shenzhen, Guangdong, Peoples R China
2.Shenzhen Univ, Affiliated Hosp 6, Hlth Ctr, Shenzhen Key Lab Endogenous Infect, Shenzhen, Guangdong, Peoples R China
3.Univ Houston, Dept Pharm Practice & Translat Res, Houston, TX 77004 USA
4.Southern Univ Sci & Technol, Jinan Univ,Shenzhen Peoples Hosp, Affiliated Hosp 1,Shenzhen Inst Resp Dis, Clin Med Coll 2,Bacteriol & Antibacterial Resista, Shenzhen, Guangdong, Peoples R China

Bai, Bing,Eales, Brianna M.,Huang, Wei,et al. Clinical and genomic analysis of virulence-related genes in bloodstream infections caused by Acinetobacter baumannii[J]. Virulence,2022,13(1).

Bai, Bing.,Eales, Brianna M..,Huang, Wei.,Ledesma, Kimberly R..,Merlau, Paul R..,...&Tam, Vincent H..(2022).Clinical and genomic analysis of virulence-related genes in bloodstream infections caused by Acinetobacter baumannii.Virulence,13(1).

Bai, Bing,et al."Clinical and genomic analysis of virulence-related genes in bloodstream infections caused by Acinetobacter baumannii".Virulence 13.1(2022).