Our flow cytometry analysis revealed a negative impact of STING deficiency on the numbers of splenic parasite-specific IFN-γ and IFN-γ/perforin-producing CD8+ T cells at day 13 after infection, which may explain why we found lower IFN-γ and perforin gene expression in the hearts of STING-KO-infected mice. Here, PRF1 is linked to infection.