Hepatitis B is transmitted when blood or certain body fluids from a person with the virus get into the body of someone who is not immune.

Main ways hepatitis B is transmitted

  • Blood-to-blood contact:
    • Sharing needles or syringes for injecting drugs.
* Unsterile medical, dental, tattoo, or piercing equipment that has infected blood on it.

* Sharing items that can have tiny, invisible blood spots, like razors, toothbrushes, nail clippers, or body jewelry.
  • Sexual transmission:
    • Unprotected vaginal, anal, or oral sex with someone who has hepatitis B, through contact with blood, semen, or vaginal fluids.
* Risk is higher with multiple partners, other STIs, or when condoms/barrier methods are not used.
  • From parent to baby (perinatal / vertical transmission):
    • Most common route in many parts of the world.
* The virus passes from an infected birthing parent to the baby during childbirth through blood contact.
  • Close household contact (horizontal transmission):
    • Living in close contact with someone who has chronic hepatitis B, especially where blood or body fluids can be shared through small cuts, shared personal items, or poor hygiene.
* HBV can stay infectious on surfaces for more than 7 days if not properly cleaned.

How hepatitis B is not transmitted

  • Not spread by casual daily contact such as hugging, holding hands, sharing food, or eating together.
  • Not spread by coughing, sneezing, or using the same toilet or doorknobs.
  • Not spread by sweat or tears in normal everyday situations.

Key body fluids involved

Hepatitis B is mainly present and spread through:

  • Blood
  • Semen
  • Vaginal fluids
  • Certain other body fluids that contain blood (for example from open wounds)

Fecal–oral transmission (like typical food poisoning or hepatitis A) is rare for hepatitis B.

Simple example

If a person with hepatitis B shares a needle, a razor, or has unprotected sex with someone who is not vaccinated or immune, the virus can enter through tiny breaks in the skin or mucous membranes and cause infection.

Brief prevention note

  • Vaccination against hepatitis B is the most effective protection.
  • Using condoms, not sharing needles, and not sharing personal items that may have blood on them (razors, toothbrushes, nail tools) greatly lowers risk.

Information gathered from public forums or data available on the internet and portrayed here.