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The antimicrobial activity of zinc against group B Streptococcus is strain-dependent across diverse sequence types, capsular serotypes, and invasive versus colonizing isolates
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The antimicrobial activity of zinc against group B Streptococcus is strain-dependent across diverse sequence types, capsular serotypes, and invasive versus colonizing isolates
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Journal Article
The antimicrobial activity of zinc against group B Streptococcus is strain-dependent across diverse sequence types, capsular serotypes, and invasive versus colonizing isolates
2022
Overview
Background
Streptococcus agalactiae
or Group B
Streptococcus
(GBS) is an encapsulated gram-positive bacterial pathobiont that commonly colonizes the lower gastrointestinal tract and reproductive tract of human hosts. This bacterium can infect the gravid reproductive tract and cause invasive infections of pregnant patients and neonates. Upon colonizing the reproductive tract, the bacterial cell is presented with numerous nutritional challenges imposed by the host. One strategy employed by the host innate immune system is intoxication of bacterial invaders with certain transition metals such as zinc.
Methodology
Previous work has demonstrated that GBS must employ elegant strategies to circumnavigate zinc stress in order to survive in the vertebrate host. We assessed 30 strains of GBS from diverse isolation sources, capsular serotypes, and sequence types for susceptibility or resistance to zinc intoxication.
Results
Invasive strains, such as those isolated from early onset disease manifestations of GBS infection were significantly less susceptible to zinc toxicity than colonizing strains isolated from rectovaginal swabs of pregnant patients. Additionally, capsular type III (cpsIII) strains and the ST-17 and ST-19 strains exhibited the greatest resilience to zinc stress, whereas ST-1 and ST-12 strains as well as those possessing capsular type Ib (cpsIb) were more sensitive to zinc intoxication. Thus, this study demonstrates that the transition metal zinc possesses antimicrobial properties against a wide range of GBS strains, with isolation source, capsular serotype, and sequence type contributing to susceptibility or resistance to zinc stress.
Publisher
Springer Science and Business Media LLC,BioMed Central,BioMed Central Ltd,Springer Nature B.V,BMC
Subject
/ Anti-Bacterial Agents - metabolism
/ Anti-Bacterial Agents - pharmacology
/ Antiinfectives and antibacterials
/ Bacteria
/ Bacterial Capsules - classification
/ Bacterial Capsules - drug effects
/ Biomedical and Life Sciences
/ Chlorides - pharmacokinetics
/ Control
/ Female
/ Humans
/ Identification and classification
/ Metal
/ Mycology
/ Neonates
/ QR1-502
/ Sepsis
/ Streptococcal Infections - blood
/ Streptococcal Infections - drug therapy
/ Streptococcal Infections - microbiology
/ Streptococcus agalactiae - classification
/ Streptococcus agalactiae - drug effects
/ Streptococcus agalactiae - genetics
/ Streptococcus agalactiae - growth & development
/ Testing
/ Toxicity
/ Vagina
/ Virology
/ Zinc
