- Use of any biologic agent (such as etanercept, adalimumab, efalizumab, infliximab, golimumab, certolizumab) within 12 weeks or five half-lives of screening, and in the case of rituximab, use within 24 weeks of screening or no recovery of CD 19-positive B lymphocytes if the last dose of rituximab has been more than 24 weeks prior to screening