No significant differences in serum IgG, IgA, neutrophils and lymphocytes were observed among the three patterns, however, the intercept of the models was consistently significant (for all: P < 0.05), once corrected for variability between hosts and their multiple sampling. This finding supports the hypothesis that the strength find more of the initial immune response is crucial in modulating the dynamics of shedding. During the second week post infection, differences in
the dynamics of infection were observed between the intermittent and the fade-out group (no data were available for the non-shedding group). The relatively low number of bacteria shed by the intermittent group (mean CFU/sec. ± S.E.: 0.083 ± 0.019) was associated with low serum IgG (OD index ± S.E.: 0.238 ± 0.028) and high serum IgA (1.107 ± 0.052) as well as high circulating neutrophils (mean K/μL ± S.E.: 1.436 ± 0.158) and lymphocytes (mean K/μL ± S.E.: 2.150 ± 0.412). buy LY333531 In contrast, the higher shedding in
the fade out group (mean CFU/sec. ± S.E.: 0.213 ± 0.045) was correlated to high serum IgG (OD index ± S.E.: 0.434 ± 0.118) and low serum IgA (0.667 ± 0.128) and white blood cells (mean K/μL ± S.E., neutrophils: 0.896 ± 0.00 and lymphocytes: 0.740 ± 0.000). Although not conclusive or statistically significant, these relationships suggest that the strength of the early antibody and blood cells response may play a role in affecting both the initial and long-term pattern of B. bronchiseptica transmission. Host immune response overview Overall, the immune response of rabbits to B. bronchiseptica infection confirmed previous findings reported in other animal models [14–19, 25]. Peripheral response Infected hosts developed a strong serum
IgG and IgA response compared to the controls (Fig. 3). The level of IgG rapidly increased in infected rabbits and remained consistently high for the duration of the N-acetylglucosamine-1-phosphate transferase infection, however and as previously highlighted, it was not sufficient to completely clear the bacteria from the upper respiratory tract (interaction between INK1197 ic50 sampling time and infected-controls, coeff ± S.E.: 0.047 ± 0.005 d.f. = 328 P < 0.0001 -corrected for the random effect of the host and its longitudinal sampling). IgA levels in infected rabbits peaked around week three post infection and decreased thereafter, probably as a consequence of the successful clearance of bacteria from the lower respiratory tract [25, 26]. Nevertheless, values remained significantly higher in infected compared to controls (coeff ± S.E.: 0.208 ± 0.056 d.f. = 45 P < 0.001) and for the duration of the experiment (interaction between infected-controls and sampling time, coeff ± S.E.: 0.0026 ± 0.001 d.f. = 410 P < 0.01; corrected for the host variability). Collectively, the systemic antibody profiles suggest that rabbit immune protection against B.