The Weekly Epidemiological Record (WER) for 17 April 2009, vol. 84, 16 (pp 133-140) includes: Resurgence of wild poliovirus types 1 and 3 in 15 African countries, January 2008-March 2009.”

Introduction
The global Polio Eradication Initiative began in 1988. By 2006, transmission of indigenous wild poliovirus (WPV) type 2 had been interrupted globally, and transmission
of indigenous type 1 and type 3 (WPV1 and WPV3) had been interrupted in all but 4 countries worldwide. (The countries where transmission has not been interrupted are Afghanistan, India, Nigeria and Pakistan.)1 During 2002-2006, 20 previously polio-free countries were affected by importations of WPV1 originating from Nigeria;2, 3, 4 3 polio-free African countries were affected by WPV1 importation originating from India.1 (Polio-free countries are those that have no evidence of indigenous WPV transmission for >12 months and where subsequent cases are determined by genomic sequencing to be of external origin.)

Relatively few importations occurred in 2007; by the end of that year, 5 countries with importations still had not interrupted WPV1 outbreaks. During 2008 and early 2009, additional WPV1 and WPV3 importations occurred in 15 countries in Africa, including the 5 countries that had not interrupted outbreaks resulting from the earlier importations.

This report summarizes information on new WPV importation events and outbreaks occurring from January 2008 to the end of March 2009 as well as information on persistent outbreaks5 following importation into previously polio-free African countries as of 24 March 2009.
http://www.who.int/wer/2009/wer8416.pdf