FIG. 5.

Association of genomic segments in recombinant strains. The genomes of strains present in isolates were analyzed by RFLP assays, and the genomic segments of recombinant genomes were identified and classified according to the vaccine strains from which the genomic segment are derived (see Table 1 for details) and according to the positions of these segments in the genome. (a) The different categories of nonrecombinant or recombinant genomes are classified according to the serotype of the isolate from which they are derived. The numbers of analyzed strains are shown. (b) The relative proportion of each of the three genomic segments in bipartite recombinant genomes is indicated according to position in the 5′ part (S1/Sx; includes S1/S2 and S1/S3, for example) or in the 3′ part (Sx/S1, for example) of the recombinant genomes. The number of different segments present in bipartite recombinant genomes described in panel a (118 segments) was considered 100%.