FIG. 2.

Integron structure and resistance gene cassettes found in V. cholerae O1. The PCR primers used and the amplicons obtained are shown below the integron structure, with the bold line representing the amplicon sequenced. att1 is a site which is responsible for recombination, and qacEΔ1 and sul1 encode resistance to disinfectants and sulphonamides, respectively. The individual gene cassettes are shown together with their recombination sites (59-bp element).