FIG. 4.

Protection from chronic chlamydial disease correlates with higher in vivo iNOS activity. The mean urine nitrite response (day 7 through day 54 postinfection) was calculated for each experimental group from the data displayed in Fig. 3 and is shown here as the solid line graph. The percent hydrosalpinx formation for each group from Table 2 is displayed as the open bars. A negative correlation exists between the mean nitrite excretion during infection and hydrosalpinx formation (correlation coefficient = −0.99952).