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Occurrence over the last 20 years of scientific articles using the terms ‘emerging infectious diseases’ for all (solid line) or viral (dashed line) diseases. Data are from ISI Web of Science covering 1980–2009. Solid line: Topic = (Emerg* infect* diseas*) AND Year Published = (year). Dashed line: Topic = (Emerg* infect* diseas*) AND Topic = (virus) AND Year Published = (year).
