Transmission
Most APIs are infected by HBV at birth by their carrier mothers (perinatal infection). Individuals who are infected at birth can develop liver cancer at age 35 or earlier. Also, individuals infected at birth will carry the virus for life, regardless of future vaccination. Transmission is also common during early childhood through direct contact with blood of infected individuals, occurring from contact between open wounds, sharing contaminated toothbrushes or razors, or through contaminated medical/dental tools. Hepatitis B can also be transmitted by blood transfusions, sharing or reusing needles for injection or tattoos, and unprotected sex.
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