What should you know about who developed the hepatitis B vaccine?

Early vaccine development used carefully prepared hepatitis B surface material. Later technology allowed manufacturers to produce the surface protein in the laboratory, creating recombinant vaccines. This part of the virus trains immune recognition but cannot cause hepatitis B infection. The vaccine protects against infection; it does not remove virus from someone who is already infected. See [Hepatitis B](/conditions/hepatitis-b/) for the illness it is designed to prevent.

You do not need to identify the original developer to decide whether vaccination is appropriate. Ask a healthcare professional to review your age, health, work or household exposure, previous doses, and any serious allergy history. Bring your vaccination record when available. Current products and schedules can vary, so follow the product and clinic advice. More practical information is available under [Hepatitis B Vaccination](/treatments/preventive-care-and-vaccination/hepatitis-b-vaccination/).

Get emergency help for difficulty breathing, throat or facial swelling, fainting, or widespread hives after vaccination. Contact a clinician quickly after a possible blood or body-fluid exposure, because vaccination alone may not be the only preventive step. Seek medical assessment for yellow skin, [dark urine](/symptoms/dark-urine/), or unexplained [fatigue](/symptoms/fatigue/).

Ask which hepatitis B vaccine is available, whether it is suitable for you, how many doses are advised, and what to do if a dose was delayed. You can also ask how suspected infection would be assessed and whether a [Liver Function Test](/treatments/diagnostics-and-screening/liver-function-test/) is relevant.