DT&E is an iterative process of designing, building, testing, identifying deficiencies, fixing, retesting, and repeating. However, equivocal test results require retesting at a later date, or performing a different test. Subsequent retesting using consensus primers detected the presence of Zika virus RNA. The original test lacked explanation for practice effects in retesting. Two parallel forms (A and B) can be used for testing and retesting. Sometimes, retesting the donor in several months will produce a "negative" ELISA antibody test. This effort was based on comprehensive retesting of DNA samples . Retesting is recommended three months after treatment. The IOC stated in October 2008 that it would begin retesting samples for CERA. Retesting during pregnancy can be performed three weeks after treatment. This may cover both the design qualification, periodic retesting, and control of the packaging processes. Retesting the pituitary hormone levels is therefore performed 2 to 3 months later. This process must be closely linked with retesting of antibiotic production. The victim was identified through retesting of DNA from remains recovered in 2001. Retesting is also recommended every ten years.