intensified environmental surveillance supporting the response to wild poliovirus type 1 silent circulation in israel, 2013. | an emergency response was triggered by recovery of wild poliovirus type 1 (wpv1) of the south asia (soas) lineage from sewage in southern israel in april 2013 during routine environmental surveillance. public health risk assessment necessitated intensification of environmental surveillance in order to facilitate countrywide monitoring of wpv1-soas circulation. this involved increasing sampling frequency and broadening the geographical area, for better coverage of the population at risk, as well ... | 2014 | 24576473 |