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ELISA O-antigen reactions of serogroup 4 L. monocytogenes strains. (A) Strain FSL-X1-010, serotype 4a; (B) strain JL2-10, serotype 4ab; (C) strain J0097, serotype 4b; (D) strain J0099, serotype 4c; (E) strain J0094, serotype 4d; (F) strain 19118, serotype 4e. Note that serotype 4e is indistinguishable from 4b in this case.
