Guidelines for environmental surveillance of poliovirus circulation
World Health Organization. Dept. of Vaccines and Biologicals. (2003). Guidelines for environmental surveillance of poliovirus circulation. Geneva : World Health Organization. http://www.who.int/iris/handle/10665/67854
Gov't Doc #WHO/V&B/03.03
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Guidelines for preparedness and response for wild poliovirus importation and format for national plans World Health Organization, Regional Office for the Eastern Mediterranean (WHO-EM/POL/157/E/G, 2002)