Fig. 3. Nested-PCR assay of serially diluted S. agalactiae ST991 genomic DNA (A),
nested-PCR assay of serially diluted S. agalactiae ST991 genomic DNA mixed with a
constant amount of genomic DNA extracted from a frozen fish brain that was negative
for the presence of the bacterium (B), and nested-PCR assay of serially diluted S. agalactiae
ST991 genomic DNA mixed with a constant amount of genomic DNA extracted
from paraffin-wax-embedded fish brain which was negative for the presence of the
bacterium (C). (A) Lane 1: S. agalactiae 10 ng of genomic DNA positive control; lane
2: 15.8 ng; lane 3: 1.58 ng; lane 4: 0.158 ng; lane 5: 15.8 pg; lane 6: 1.58 pg; lane 7:
0.158 pg; lane 8: 15.8 fg; lane 9: 1.58 fg; lane 10: 0.158 fg; lane 11: negative control;
lane 12: 100 bp DNA ladder. (B) Lane 1: 100 bp DNA ladder; lane 2: 10 ng of S. agalactiae
genomic DNA positive control; lane 3: 6.95 ng; lane 4: 0.695 ng; lane 5: 69.5 pg; lane 6:
6.95 pg; lane 7: 0.695 pg; lane 8: 69.5 fg; lane 9: 6.95 fg; lane 10: 0.695 fg; lane 11:
0.0695 fg; lane 12: negative control. (C) Lane 1: 100 bp DNA ladder; lane 2: 10 ng of
S. agalactiae genomic DNA positive control; lane 3: 6.95 ng, lane 4: 0.695 ng; lane 5:
69.5 pg, lane 6: 6.95 pg, lane 7: 0.695 pg, lane 8: 69.5 fg, lane 9: 6.95 fg, lane 10:
0.695 fg, lane 11: negative control.