IL10 and infection: Finally, the authors investigated whether IL-10 production by NK cells is essential for the IL-15C-mediated protection by transferring NK cells from IL-15C-treated wt or Il10−/− mice into wt recipients on day 2 post-PbA infection; they found that the transfer of wt NK cells protected against ECM, while most PbA-infected mice receiving Il10−/− NK cells died, similar to untreated controls.