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The difference in Smad7 expression between the primary and secondary infections may indicate that after initial low-dose infection, the zebrafish immune system was able to tolerate the invading pathogen, thereby shifting the immune response toward infection tolerance.
Many bat species exhibit a high infection tolerance towards harboured pathogens, making bats a favourable host of different viruses and also a critical target for medical and veterinary research.
One such function has been recently highlighted by the results of Duerr et al [10], who showed that including immunosuppression or infection tolerance processes could, in combination with the other positive density dependent processes, further shift parasite elimination thresholds to higher values.
Infection tolerance through static chronic infection, which may not have major fitness consequences, should be integrated in future theoretical work on defense and infectious disease dynamics.
More specifically, although Smad7 can suppress the TGF-β signaling pathway to initiate infection tolerance, it can also promote immunity triggered through the IFN-γ signaling pathway.
However, in secondary infection with a lethal pathogen dose, increased Smad7 expression suggests that the immune response is triggered to defend against the invading pathogen; thus, the pathway responsible for infection tolerance is inhibited in this phase.
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Simultaneous selection for low severity and short duration of infection and tolerance (little impact of infection on growth) would only be possible if tolerance were evaluated over a sufficiently long time period, since in the shorter term, high tolerance implies high GP (Figure 4D F).
In spite of high literacy about how to prevent HIV infection, greater tolerance should be demonstrated towards those who get infected.
Dendritic cells (DCs) orchestrate a repertoire of immune responses that endows resistance to infection and tolerance to self.
The important criteria in the choice of graft or interpositional material are cost, esthetic consequences after graft removal, long-term behavior, risk of infection, biocompatibility, tolerance, and prevention of recurrence [16].
This ensures infection and tolerance to reinfection.
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