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Ana (70112-2699) USA Email: David G Nielsen - dnielsen@tulane.eduPublished: 27 November 2009 Virology Journal 2009, 6:211 doi:10.1186/1743-422X-6-Received: 27 October 2009 Accepted: 27 NovemberThis article is available from: http://www.virologyj.com/content/6/1/211 ?2009 Nielsen; licensee BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribu