Table 3.

Classification of Countries in Context of Polio Eradication Initiative in 2012

Country Typea	Hygiene Statusa	Examples	Eradication Categoryb	R0 Rangesa
Industrialized country	Good	United States, Western Europe, Australia, etc.	A	4
Industrialized country	Poor	South America, Russia	A	10
Developing country	Poor	Egypt, Eastern Europe, Northern Africa, Middle East, etc.	A	12
Developing country	Dense and poor	India	A	14–18
Developing country	Poor	Horn of Africa (e.g., Congo, Uganda)	B	8–12
Developing country	Poor	Central Asia (e.g., Tajikistan, Turkmenistan)	B	10–14
Developing country	Poor	Angola, Chad, Democratic Republic of the Congo, and Sudan	C	8–12
Developing country	Poor	Afghanistan, Nigeria, and Pakistan	D	14–17

^a Country type, hygiene status, and R₀ values were chosen from Fine and Carneiro's polio transmission review (26).

^b Country classification is based on the Global Polio Eradication Initiative (1). Category A corresponds to countries that have achieved eradication; Category B describes countries that have achieved eradication but have transient epidemics; Category C describes countries that have achieved eradication but have reestablished transmission; and Category D describes countries that have not achieved elimination.