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.
HEPATITIS B VACCINATION. The first hepatitis B vaccine became commercially available in the United States in 1982. In. 1986, a hepatitis B vaccine produced by recombinant DNA technology was licensed and a. second recombinant-type hepatitis B vaccine was licensed in 1989. The two recombinant DNA. vaccines (Recombivax HB and Engerix-B) are the only hepatitis B vaccine preparations. currently used in the United States.