Inactivation of SLC35A1 in HeLa cells inhibits infection by VSV-LCMV and VSV expressing the glycoproteins of PIV5 (VSV-PIV5), a paramyxovirus that uses sialic acid as entry receptor (46) (Fig. 4A and SI Appendix, Fig. S4 A and B). The gene discussed is SLC35A1; the disease is infection.