The result revealed that after a 30 min incubation period during which the mixtures three separate mixtures (HIV-1 plus crude saliva), (HIV-1 plus MUC5B) and (HIV-1 plus MUC7) were incubated with the CD4+ CEM SS cells, no HIV-1 infection of these cells was observed (Fig. 7). Here, MUC5B is linked to HIV-1 infection.