You will receive blinatumomab by vein non-stop on Days 1-28 of Cycles 1-5. Blinatumomab will be delivered by a small pump, which you will carry with you for the whole time you receive the drug. This allows you to receive the drug constantly over a long period of time. You will be given a shoulder or belt bag to hold the pump and infusion bag. You will be able to wear regular clothes, walk around, and perform daily living activities. You will be given instructions for taking a shower and other activities. However, because the line must be kept free of infection and connected to the pump at all times, some activities (like swimming) are not allowed during the study. The study staff will give you more information on activities you should not do while receiving the drug.