http://www.who.int/biologicals/publications/meetings/areas/vaccines/polio/Guidelines%20imple%20pre_erad_polio%20April%202000.pdf

It provides guidelines on the implementation of the pre-eradication phase of the action plan by initiating two critical steps: surveying all medical/biological laboratories that might possess wild poliovirus infectious and/or potentially infectious materials and establishing a global inventory system for laboratories that retain such materials. Document in pdf format; Acrobat Reader required