Table 2.

Detection of T. pallidum in CSF after freezing and thawing

No. of organismsDetectionaafter freeze-thaw cycle(s) numbering:
0123
500++++++++
50++++++++
25+++b
10++++
5++++
  • a See Table 1, footnote b, for explanation of symbols.

  • b —, no T. pallidum DNA detected by PCR.