A Gambian study showed that HCMV+ infants had similar antibody responses to measles, tetanus and Haemophilus influenzae b (Hib) vaccination at 13 and 18 months of age as compared to their HCMV- counterparts; and while they had lower CD4+ IFN-γ responses to measles 1 week after vaccination, there was no effect on measles-specific immunity 4 months post-vaccination (8). This evidence concerns the gene IFNG and measles.