In family contacts of MERS-CoV cases, serologic analysis showed that of 280 contacts, 19 (6.7%) had positive recombinant enzyme-linked immunosorbent assay (rELISA) S1, 6 (2.1%) had positive recombinant immunofluorescence assay (rRIFA) full S, and only 4 (1.4%) had positive plaque-reduction neutralization screening (PRN) [8]. to identify cases for the isolation and application of quarantine steps. […]