Seventeen patients received LAVs: 12 patients received MMR vaccine (P2, P4, P7, P8, P9, P10, P11, P12, P13, P14, P15, sibling 1), 1 patient measles vaccine (P17), 1 patient both the measles and MMR vaccines (sibling 3), and 3 patients both the MMR and VZV vaccines (P16, P18, sibling 2). Here, MRC1 is linked to measles.