(The airline is working with the Centers for Disease Control and Prevention to warn the passengers.)
Health officials are trying to find passengers of four Southwest Airlines flights last month that may have been exposed to the measles.
The travelers shared flights on Aug. 21 Aug. 22 with someone from North Texas, who later was diagnosed with the highly contagious virus. The flights went to Dallas, Houston and Harlingen.
The airline is not releasing the identity of the traveler with the measles, a Southwest Airlines spokesperson added.
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The Houston Department of Health says that the help of the passengers who may have been exposed to the virus.
The ministry of health says that the passengers exposed to this patient might develop symptoms until the end of Sept. 12.
The symptoms include skin rash, high fever, cough, runny nose and red, watery eyes
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This research is coordinated by the Texas Department of State Health Services.