Definition of elegy for English Language Learners. : a sad poem or song : a poem or song that expresses sorrow for someone who is dead.
Hepatitis B was first discovered in 1963 by Dr. Baruch Blumberg and colleagues, who identified a protein (the âAustralia antigenâ that reacted to antibodies from patients with hemophilia and leukemia.
INFECTIOUS AGENT. Hepatitis B is a disease caused by hepatitis B virus (HBV), a small, circular, partially double-stranded DNA virus in the Hepadnaviridae family. TRANSMISSION. HBV is transmitted by contact with contaminated blood, blood products, and other body fluids (such as semen).