Primer-template specificity binding was empirically determined
in reactions of which optimized PCR parameters were
analyzed upon the amplification efficiency of three multiplex
primer sets that specifically bind to V. cholerae gDNAs of the
O1, O139, or O22/O155. We initially optimized the separate
reactions containing the gDNA content of V. cholerae O1
569B or O139 MO45 alone, or equally mixed. Most reliable
amplification conditionswere reproducibly performed on the
reactions using a 10 ng each of V. cholerae O1 569B or O139
MO45 per reaction assay, or equally mixed. The resulting
algorithmupon annealing temperature above 55∘Cwas likely
to decrease amplification yields of the specific amplicons with
expected sizes (data not shown).All reactions containingO22
or O155 gDNA putatively yielded a 588 bp DNA band (data
not shown). Optimum annealing temperatures ranged from
53∘C to 57∘C. It was clear that PCR factors underlying the
annealing temperatures and primer set concentrations were
more likely to influence the amplification efficiency whether
the O1, O139, or equally mixed gDNAs were used. As a
result, optimized multiplex PCR amplification depended on
annealing temperature at 55∘C and primer set concentrations
of 0.4 (universal), 0.4 (O1-specific), and 1.0 (O139-specific)