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antibodies, boy, chickenpox, child, clinic, clinical, diphtheria, disease, doctor, epidemiology, fever, flu, germs, healthcare, hepatitis, immunisation, immunity, infection, infectious, injection, intravenous, kid, measles, medical, medicine, meningococcal, mumps, needle, pertussis, physician, polio, practitioner, professional, protection, rubella, sars, smallpox, specialist, sterile, surgeon, tetanus, tuberculosis, vaccination, vaccine, varicella, white, worker,