Table 1.

Number of infected rats from each experimental group (positive cultures) and the number of rats analyzeda

Experimental Group, DurationPositive CulturesNo. Analyzed
NI, 2 wk37
NI, 4 wk37
NI, 6 wk37
NI, 8 wk19
CI, 2 wk37
CI, 4 wk28
CI, 6 wk010
CI, 8 wk19
AC (no injection)37
  • a AC, age control; CI, catheter injection; NI, needle injection.