IL-15 levels in vivo were also significantly related to virus loads in nasal lavage (r = −0.57, p = 0.005), induced sputum (r = −0.44, p = 0.041) and BAL (r = −0.61, r = 0.024) upon subsequent in vivo RV16 experimental infection in the same subjects (Figure 6C–E). The gene discussed is IL15; the disease is infection.