TLR9 and infection: However, in fitting with the conclusion that initial DC responses during acute infection have a minimal impact on memory T‐cell development, we failed to boost M38‐ and IE3‐specific memory CD8+ T‐cell responses induced by subcutaneous ΔgL‐MCMV infection co‐administered with activating ligands of DC‐expressed endosomal TLR7 or TLR9 (data not shown).