This design, therefore, is more comprehensive than previous experiments with other avian pathogens that only assessed the contrast of non-challenged with challenged birds [ 27, 28].
Forty PCV2 seronegative 3-week-old pigs were randomly divided into the following four groups: vaccinated challenged (T01), vaccinated non-challenged (T02), non-vaccinated challenged (T03), and non-vaccinated non-challenged (T04) animals.
Thus T. tenuis abundance was higher in parasite challenged than non-challenged males, irrespective of T treatment.
Several predominate immune pathways, Toll-like receptor, Jak-STAT, and cytokine signaling, were represented between challenged and non-challenged groups.
After challenge, no significant differences between the groups were observed in the numbers of Salmonella-excreting animals, when considering all challenged and non-challenged pigs.
Non-challenged, lovastatin-treated and challenged, untreated mice were also used as control groups in the study.
Vaccinated challenged (T01) and vaccinated non-challenged (T02) animals showed an increase in the relative proportions of CD3+ and CD4+ cells at 0 dpc compared with non-vaccinated challenged (T03) and non-vaccinated non-challenged (T04) animals (p < 0.05).
Non-challenged BALB/c mice, BALB/c mice challenged with ethanol and non-engrafted SCID mice treated with oxazolone served as controls in this experiment.
PCV2-specific IFN-γ-SCs increased sharply in vaccinated challenged (T01) and vaccinated non-challenged (T02) animals at 0 dpc (2 weeks after vaccination).
The feed conversion ratio was better (P = 0.05) in the challenged birds, compared to the non-challenged, in the last two weeks of the experiment.
Comb area decreased more in challenged males (T0P+) than in non-challenged males (T0P0; Fig. 4a).
