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A chronic infectious liver disease with several different types. Hepatitis A, B and C are the most common and can all be transmitted sexually. All require medical care. Vaccines are available for hepatitis A and B.

How well something works under ideal or controlled conditions, like efficacy proven through scientific study.

L = lesbian, G = gay, B = bisexual, T = transgender. Additional letters sometimes added include Q = queer/questioning, U = unsure, I = intersex, P = pansexual, A=asexual, S = straight allies.