The present invention relates to a sheet processing apparatus comprising, sheet stacking means for stacking sheet, sheet binding means for binding a sheets and conveying means for conveying the sheet stacked on the sheet stacking means so as to change sheet binding positions. Also provided are oligonucleotide probes and primers derived from the recombinant nucleic acid sequences and methods for their use in the detection and identification serovar 4 and genomic cluster IIB strains. Essentially, the detection rule is not dependent on the configuration of the radio receiving unit.