CLDN1 and infection: For hepatitis C virus (HCV) infection, multiple cellular factors are required for efficient viral entry, including low density lipoprotein receptor (LDLR), scavenger receptor class B type I (SR-BI), CD81, occludin (OCLN) and claudin-1 (CLDN-1) as viral entry receptors and Niemann-Pick C1-like 1 (NPC1L1), epidermal growth factor receptor (EGFR) and ephrin A2 (EphA2) as other factors involved in entry [21,47,48].