The CDC and Southwest Airlines are warning passengers on four regional flights throughout Texas they may have been exposed to measles.

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Anyone who has been in contact with the man should seek medical attention, especially those in the state of Texas who have traveled between Dallas, Houston, and Harlingen.

According to an airline representative to the Fort Worth Star-Telegram, four flights, in particular, could have been affected:

Flight No. 5: between Dallas and Houston on Aug. 21, 2018

Flight No. 9: between Houston and Harlingen on Aug. 21, 2018

Flight No. 665: between Harlingen and Houston on Aug. 22, 2018

Flight No. 44: between Houston and Dallas on Aug. 22, 2018