<prompt> Live attenuated vaccine can be given to:Children under 8 yearsHIV patientsPatients on steroidsPatients on radiation  <response>: Ans. a Children under 8 yearsRef.: K. Park 23rd ed. 103, 21st ed 28 Live vaccines are prepared from live generally attenuated organisms. Generally live vaccines are more potent then killed vaccines . In case of administration of live vaccines usually require single dose except polio vaccine which require 3 doses . Live vaccines are usually contraindicated in persons with immunodeficiency disorders or persons with leukemia, lymphoma, malignancies, or because of therapy with alkylating agents, corticosteroids, radiotherapy, antimetabolite drugs. Pregnancy is the another contraindication unless risk of infection exceeds the risk of harm to the fetus . 