http://apps.who.int/iris/handle/10665/65953

It presents information on accreditation of Global Polio Network Laboratories, molecular epidemiology of wild poliovirus circulation, intratypic differentiation of polioviruses, laboratory communications, global action plan for containment of laboratory stocks of wild polioviruses, and review of the Manual for the virological investigation of poliomyelitis, and of environmental surveillance for wild polioviruses. Document in pdf format; Acrobat Reader required.