A) Responses to HPIV3 protein from donor PBMCs at day 0 were seen in only 3 of 7 tested donors, and only reached statistical significance for Fusion protein (* p=0.047). B) At day 10 of culture, responses to HPIV3 were robust and uniform (n=13), with responses to each protein reaching statistical significance (**p=0.00005, ***p=0.0000002, ****p=0.00027, *****p=0.00022).