Update: Polio this week – As of 20 March 2013
Global Polio Eradication Initiative
http://www.polioeradication.org/Dataandmonitoring/Poliothisweek.aspx

[Editor’s Extract and bolded text]
– In 2013, no WPV3 cases have been reported. Over the past six months, only two cases due to this strain were reported worldwide (both in Nigeria, the most recent had onset of paralysis on 10 November). In Asia, no WPV3 cases have been reported since last April. It is the lowest levels of WPV3 transmission ever recorded.
– The latest information on polio-related research activities have been published in the newest edition of Polio Pipeline, available here [pdf].

Nigeria
– One new WPV case was reported in the past week (WPV1 from Bauchi), bringing the total number of WPV cases for 2013 to five. It is the most recent case in the country and had onset of paralysis on 13 February. The total number of WPV cases for 2012 remains 122.

Pakistan
– The security situation continues to be monitored closely, in consultation with law enforcement agencies. Immunization activities continue to be implemented, in some areas staggered or postponed, depending on the security situation at the local level.

Chad
– One new cVDPV2 case was reported in the past week, with onset of paralysis on 4 February (from Salamat, in the east of the country). It is the first cVDPV2 case in Chad in 2013. The total number of cVDPV2 cases for 2012 remains 12.