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Effect of irradiation from a 310-nm UV lamp (A) and from the sun (B) on the survival of strains of the O3:K6 pandemic clonal complex with and without the 42-kb DNA plasmid, PMC 58.5 (○) and PMA 37.5 (•), respectively. ⧫, PMC 58.5 cured with acrydine orange; ⋄, PMC 58.5 spontaneously cured after UV irradiation.
