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Second, Israel reminds us that strong surveillance systems are key to rapidly detecting and responding to polio threats. A first-class environmental surveillance system テ「ツ?ツ which involves testing sewage or other environmental samples for the presence of poliovirus テ「ツ?ツ allowed Israel to launch its response before the onset of any cases. Similar rapid mobilization took place in Egypt earlier this year, when polio was found in two sewage samples.