This report reveals a renal cyst infection complicated by bacteremia associated with Actinotignum schaalii in elderly patients, indicating a need for awareness.
Actinotignum schaalii is a facultatively anaerobic, gram-positive bacillus which is increasingly being recognized as a uropathogen, particularly in elderly patients with urogenital abnormalities. While A. schaalii is associated with urinary tract infections, its involvement in renal cyst infections is unclear, and a search of past studies failed to reveal any previously reported cases.
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Kodaira et al. (2026) studied this question.
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