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hepatitis B
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Hepatitis B virus (HBV)
Gloved hands draw liquid from a vial into a syringe, overlaid on a digitally colored microscopic image of a virus with round particles in clusters.
Infographic showing estimated lives saved by childhood vaccinations worldwide from 1974 to 2024, with syringe-shaped bars for each disease. Measles tops the list at 93.71 million lives saved, followed by tetanus, whooping cough, and others, for a total of 153.84 million lives saved. Vaccines by the numbers
Quizzes
A Yorkshire terrier dressed up as a veterinarian or doctor on a white background. (dogs)
A Visit with the Word Doctor: Medical Vocabulary Quiz
full human skeleton
Diseases, Disorders, and More: A Medical Quiz
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44 Questions from Britannica’s Most Popular Health and Medicine Quizzes
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hepatitis B: Media

infectious disease
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Videos

How We Develop New Vaccines
Worried about diphtheria? No? Thank vaccines.
Video: Encyclopædia Britannica, Inc.

Images

Hepatitis B virus (HBV)
Colorized microscopic image of hepatitis B virus particles (teal).
National Institute of Allergy and Infectious Diseases
Lives saved by childhood vaccinations, 1974–2024
Vaccines and the estimates of lives saved over the period 1974–2024.
Encyclopædia Britannica, Inc.

Interactives

Vaccines by the numbers
Interactive chart displaying lives saved or birth rate increase from vaccines.
Encyclopædia Britannica, Inc.
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