This investigation has some limitations as 34% of
close contacts were unable to be traced, most of whom
were passengers from the same flight as the confirmed
case. Obtaining details of these contacts was difficult as
not all passengers provided an address or phone number
on their passenger arrival cards. Therefore their health
status was not established, although there has been no
reports of other MERS cases associated with this flight.
A strength of the study was that all Category C contacts
were traced.