Texas Christian University reports 30 cases of symptoms, ten confirmed. (Fort Worth). The 90 cases in Dallas schools not yet confirmed.
Dallas County had 431 confirmed cases of swine flu by August 4 according to the Dallas Morning News (Associated Press, Aug. 27, 2009).
However, Dallas County stopped accepting samples last May.

Texas will be a black hole in reporting; common flu is not reportable in Texas, and it is pretty well up to institutions to arrange for testing for swine flu among their students. Reliable data may be hard to get.