 - Patients who have received live attenuated vaccines 1 week prior to registration and during the study; note: patient should also avoid close contact with others who have received live attenuated vaccines; examples of live attenuated vaccines include intranasal influenza, measles, mumps, rubella, oral polio, Bacillus Calmette-Guerin BCG, yellow fever, varicella and TY21a typhoid vaccines 