Variant O89 O-Antigen of Is Associated With Group 1 Capsule Loci and Multidrug Resistance.

Bacterial surface polysaccharides play significant roles in fitness and virulence. In Gram-negative bacteria such as , major surface polysaccharides are lipopolysaccharide (LPS) and capsule, representing O- and K-antigens, respectively. There are multiple combinations of O:K types, many of which are well-characterized and can be related to ecotype or pathotype.