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Source
This diagram is self-made, the accuracy has been checked using Collier, Leslie; Balows, Albert; Sussman, Max (1998) Topley and Wilson's Microbiology and Microbial Infections ninth edition, Volume 1, Virology, volume editors: Mahy, Brian and Collier, Leslie. p. 760 Arnold. ISBN0-340-66316-2Graham ColmTalk 11:25, 4 January 2009 (UTC)