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Percentages of serotype 4b and 1/2a strains resulting from mixed enrichments in BLEB with lettuce. Shaded bars, serotype 4b strains; open bars, serotype 1/2a strains. The serotype 1/2a strains are indicated on the x axes. (A) RM2387 versus serotype 1/2a strains; (B) RM2199 versus serotype 1/2a strains; (C) RM3176 versus serotype 1/2a strains.
