Robert Holzwarth, Texas prisoner # 747140, was convicted of aggravated sexual assault after a jury trial and was sentenced to 18 years of imprisonment and fined $5,000. He appeals the district *226 court’s denial of his 28 U.S.C. § 2254 application. We granted a certificate of appealability to determine whether Holzwarth received ineffective assistance of counsel during the punishment phase of trial due to his counsel’s failure to investigate the victim’s medical records. The medical records could have been used to impeach the victim’s testimony that she had contracted genital warts, suffered a miscarriage, and had to have a hysterectomy following the assault.

Under the Antiterrorism and Effective Death Penalty Act, a state court’s adjudication of an issue on the merits is entitled to deference. Hill v. Johnson, 210 F.3d 481, 485 (5th Cir. 2000). The petitioner has the burden of rebutting the state court’s findings by clear and convincing evidence. § 2254(e)(1). We must defer to the state court’s decision unless it “was contrary to, or involved an unreasonable application of, clearly established Federal law” or “resulted in a decision that was based on an unreasonable determination of facts in light of the evidence presented in the State court proceeding.” § 2254(d)(1) & (d)(2); see Price v. Vincent, 538 U.S. 634, 639, 123 S.Ct. 1848, 155 L.Ed.2d 877 (2003). Holzwarth has not met his burden of showing that the state court’s determination that he was not prejudiced by counsel’s failure to investigate the victim’s medical records was unreasonable. See § 2254(e)(1); Strickland v. Washington, 466 U.S. 668, 687, 694, 697, 104 S.Ct. 2052, 80 L.Ed.2d 674 (1984). Accordingly, we affirm the denial of Holzwarth’s § 2254 application.

AFFIRMED.