Summary of new viruses this week: Afghanistan – two new wild poliovirus type 1 (WPV1) positive environmental samples. Democratic Republic of the Congo – circulating vaccine-derived poliovirus type 2 detected in the stool samples of two healthy contacts of two different negative AFP cases. Nigeria – one new case of cVDPV2, and two new cVDPV2 positive environmental samples. Somalia – one new case of cVDPV2. See country sections below for more details.