The South Korean government is keeping close tabs on 21 people who came into close contact with a man who tested positive for MERS last week.
However,... the government has admitted it hasn't been able to contact 50 of the 115 foreigners who had non-direct or "ordinary" contact with the patient.
Those who came within two meters of the MERS patient are considered to have come into 'close contact'.
As of Monday, six people,... including one flight attendant who had close contact with the patient, have undergone tests.
Of them, a British woman,... tested negative twice and was discharged from hospital,... the five others are awaiting a second round of tests after testing negative the first time.
During the 2015 MERS outbreak in South Korea,... dozens of people died after contracting the virus.