ALDH18A1 and infection: When SP-Ds were preincubated with rVSV-RFP-GP-R pseudoparticles, only hSP-D enhanced the GP-R pseudotyped particles’ infection in VeroE6 (p = 0.0052, two-tailed unpaired Student’s t-test) (Figure 5A) when compared with the non-preincubated particles.