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This paper identifies PgaR as a positive regulator of the pgaABCD operon in Klebsiella pneumoniae, showing that genetic variation in this region leads to loss or hyper-production of PNAG, with distinct fitness consequences.

This paper shows that Klebsiella pneumoniae produces extracellular PNAG in vitro but switches to cell-associated PNAG during lung infection, highlighting its potential as a vaccine antigen.