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The 3.6-kb seroconverting cassette of the D3 bacteriophage genome. The three genes involved in serotype conversion encode the Wzyα inhibitor (iap; 96 bp), O-acetylase (oac; 2,064 bp), and O-antigen β-polymerase (wzyβ; 1,160 bp). The iap, oac, and wzyβ genes correspond to nucleotides 21099 to 21003, 21281 to 23345, and 24580 to 23420 of the D3 genome, respectively (25, 39).
