If you have or have had an allergy to PEG-asparaginase, we will give another form of asparaginase (Erwinia asparaginase). Four doses of Erwinia asparaginase will be given in the muscle twice a week beginning on Day 5 and then another 4 doses will be given in the muscle twice a week beginning on Day 15 in place of the scheduled doses of PEG-asparaginase.