8. Female participants of childbearing potential must not be pregnant or breast-feeding, must have a negative pregnancy test at screening and must practice an adequate method of birth control. Males able to father a child must agree to practice birth control. Acceptable methods of birth control include hormonal contraception (birth control pills, injected hormones or vaginal ring), intrauterine device, barrier methods with spermicide (diaphragm with spermicide, condom and spermicide) or surgical sterilization (hysterectomy, tubal ligation or vasectomy in a partner). If a participant is of childbearing potential, she must be willing to undergo monthly urine pregnancy tests. Both males and females must agree to use adequate birth control for three months after the intravitreal infliximab injection.