A common vitamin can act as a shield that makes superbugs immune to 'last-resort' antibiotics.
April 14, 2026
Original Paper
Nutrient-Driven Small-Colony Variants as an Adaptive Outcome in Carbapenem-Resistant Acinetobacter baumannii
SSRN · 6571421
The Takeaway
Vitamin B12 tells bacteria to hunker down into a dormant, slow-growing state. In this state, the strongest antibiotics in a doctor's arsenal become useless, allowing the bacteria to survive the very drugs designed to kill them.
From the abstract
Carbapenem-resistant Acinetobacter baumannii (CRAB) is a serious threat, and resistance to the last-resort drug cefiderocol is emerging. However, how host micronutrients drive persistence-like adaptation is poorly defined. Using the AB5075 and CDC AR Bank #0033 (M27835) CRAB isolates, we combined time-kill assays, whole-genome sequencing, gene expression analysis, and phenotyping to test how vitamin B12 promotes small-colony variants (SCVs) and alters cefiderocol response. Vitamin B12 reproducib