The Emergent Invasive Serotype 4 ST10172 Strain Acquires vanG-Type Vancomycin-Resistance Element: A Case of a 66-Year-Old With Bacteremic Pneumococcal Pneumonia.

Chochua, Sopio; Beall, Bernard; Lin, Wuling; Tran, Theresa; Rivers, Joy; Li, Zhongya; Arvay, Melissa L; Kobayashi, Miwako et al. · J Infect Dis · 2025

case_report · Level V

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Abstract

We report a single case of invasive pneumococcal disease (IPD) by serotype 4, multilocus sequence type 10172 (ST10172) isolate with vanG-type resistance genes and reduced vancomycin susceptibility. The isolate was recovered during 2022 from a 66-year-old resident with bacteremic pneumococcal pneumonia within a Centers for Disease Control and Prevention Active Bacterial Core surveillance (ABCs) site hospital. The patient had received 23-valent pneumococcal polysaccharide vaccine and there was no evidence of concurrent or prior receipt of vancomycin in the previous year. Serotype 4/ST10172 IPD has shown increases within western ABCs sites, and the recent acquisition of a vanG element warrants close monitoring of this lineage.

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