CD46 and infection: Consistent with previous observations that Ad37 fiber can bind to both CAR and CD46 [26], [27], we now found that both CAR and CD46 were masked following Ad37 infection, but not to same extent as when infected with Ad11 and Ad35 (CD46) or Ad4 and Ad5 (CAR), which is in agreement with our previous report of Ad37 using sialic acid as a receptor [28].