In addition, active transmission of MERS-CoV among the nine dromedary camels was suggested by a rising MERS-CoV antibody titer and the detection of MERS-CoV RNA and viral isolation from the nasal secretions of Camel B, along with evidence of MERS-CoV antibody titers in the other eight camels that were either high (in four camels) or rising (in four camels).