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Resistance and tolerance are vital for survivability of the host-pathogen relationship. Virulence during Toxoplasma infection in mice is mediated by parasite kinase-dependent antagonism of IFN-γ-induced host resistance. Whether avirulence requires expression of parasite factors that induce host tolerance mechanisms or is a default status reflecting the absence of resistance-interfering factors is not known. In this study, we present evidence that avirulence in Toxoplasma requires parasite engagement of the scavenger receptor CD36. CD36 promotes macrophage tropism but is dispensable for the development of resistance mechanisms. Instead CD36 is critical for re-establishing tissue homeostasis and survival following the acute phase of infection. The CD36-binding capacity of T. gondii strains is negatively controlled by the virulence factor, ROP18. Thus, the absence of resistance-interfering virulence factors and the presence of tolerance-inducing avirulence factors are both required for long-term host-pathogen survival.

Cutting Edge: CD36 Mediates Phagocyte Tropism and Avirulence of Toxoplasma gondii