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Hepatitis B (HBV) is a common viral infection that targets liver cells. According to the World Health Organization, about a third of the world¡¯s population had been exposed to it as of June 2026, and roughly 254 million people have a chronic hepatitis B infection.

But how serious is hepatitis B? Can you catch it just by kissing someone? And can hepatitis B be cured? Here¡¯s what you need to know.