© Photographer: Showface | Agency: Dreamstime.com A happy boy receives a vaccination shot against a disease, virus or flu in his arm by a doctor or nurse. flu shot, flu shot child, boy receives, boy getting, hepatitis, flu, boy, disease, doctor
, vaccination, antibodies, background, chickenpox, child, clinic, clinical, diphtheria, epidemiology, female,fever, germs, healthcare,
immunisation
, immunity, infection, infectious
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