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Dot blots using 15 probes and genomic DNA from 44 S. uberis isolates. The following groups of probes were used: Taxonomic probes (U1, U2, A1, A2); nisin operon (NU1, NU3); virulence factors (V1, V2, V3, V4, V6, V7) and antibiotic resistance (R1, R2, R3). The top grid represents the position of the DNA from each S. uberis isolate in the nylon membrane. C+ DNA used as template for probe labeling; C− TE buffer.
