IL10 and Sepsis: This study documents: 1) a survival benefit with administration of ATL313 during live E. coli and S. aureus sepsis (in conjunction with an antibiotic) and in LPS-induced sepsis; 2) a decrease of TNF-α, MIP-1α, MCP-1, IFN-γ, and IL-17 blood concentrations in animals receiving A2A AR agonists with a concordant increase in IL-10 concentrations; and 3) a relative increase in circulating peripheral blood leukocyte concentrations in mice receiving ATL313 when compared to controls.