Table 1.

Accreditation criteria for virus isolation and intratypic differentiation (ITD).

1	Tests are performed on at least 150 stool specimens annually:
2	Results are reported on at least 80% of all AFP specimens within 14 days:
3	At least 80% of suspected poliovirus isolates from AFP cases and contacts are forwarded for ITD within 7 days, if applicable:
4	Accuracy of identification of polioviruses among all isolates obtained in L20B cells is at least 90%:
5	Score on most recent virus isolation PT is at least 90%:
6	Score on annual on-site review is at least 80%:
7	ITD test results on ⩾80% of poliovirus isolates are reported within 7 days:
8	Non-Sabin-like poliovirus and ITD-discordant isolates from ⩾80% of AFP cases, contacts and other sources are referred for sequencing within 7 days of detection, if applicable:
9	Score on most recent intratypic differentiation PT is at least 90%:   Score for rRT-PCR ITD: Score for rRT-PCR VDPV screening:
10	Accuracy of poliovirus serotype and intratype is at least 90%:
11	Score on annual on-site review is at least 90%:
12	Annual NPEV isolation rate is: