Table 2.

Outbreaks of Polio Due to Circulating Vaccine-Derived Poliovirus in the World Health Organization Western Pacific Region, 2001–2012

Country	Year(s)	Poliovirus Type	Divergence, %	AFP Cases, No.	Positive Contacts, No.	Compatible/Epidemiologic Link, No.
Philippines	2001	1	>3	3	1	0
China	2004	1	1 −1.3	2	4	1
Lao PDR	2004–2005	2	1.10	1	2	0
Cambodia	2005–2006	3	>2	2	0	1
China	2006	1	1.4–2.2	1	6	0
China	2011–2012	2	0.6–1.2	3	2	0

Abbreviations: AFP, acute flaccid paralysis; Lao PDR, Lao People’s Democratic Republic.