TABLE 3 

Retention of infectivity by in vitro-cultured T. pallidum Nichols

T. pallidum
dosage per site
No. of lesions/
no. of sites inoculated
Day of lesion
development
Avg day of lesion
development
Experiment A: inoculum = 45-day culture
460,0004/47, 7, 7, 77.0
100,0004/48, 8, 8, 88.0
10,0004/49, 11, 11, 1110.5
1003/418, 19, 2019.0
102/421, 2623.5
Experiment B: inoculum = 116-day culture
10,0006/611, 11, 11, 11, 11, 1211.2
1,0006/611, 11, 11, 11, 11, 1211.2
1006/614, 16, 16, 17, 17, 1816.3
106/623, 24, 24, 25, 29, 2925.7
13/619, 36, 3630.3