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<http://schema.org/text>
"The transmission of Hepatitis B through sex is not very efficient. Transmission through infected blood is more efficient and common.\r\nIt is quite possible for the spouse of a hepatitis B positive patient to be seronegative. The factors affecting the transmission depend on the level of the virus in the blood the markers for which include viral load (through molecular methods like PCR / NASBA) and HBeAg."
<https://doctor.ndtv.com/faq/is-hepatitis-b-transmitted-through-sex-2130>