Etymology
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Helga 
fem. proper name, from Old Norse Helga, literally "holy," from Proto-Germanic *hailaga, from PIE *kailo- (see health). A doublet of Olga.
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Olga 

fem. proper name, Russian, probably from Norse Helga, literally "holy," from Proto-Germanic *hailaga (from PIE *kailo-; see health). The masc. form is Oleg.

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Medicare (n.)

name for a state-run health insurance system for the elderly, 1962, originally in a Canadian context, from medical (adj.) + care (n.). U.S. use is from 1965; the U.S. program was set up by Title XVIII of the Social Security Act of 1965.

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CDC 
abbreviation of Centers for Disease Control, renamed 1970 from earlier U.S. federal health lab, originally Communicable Diseases Center (1946). Since 1992, full name is Centers for Disease Control and Prevention, but the usual initialism (acronym) remains CDC.
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