Assertion: polio | /r/CapableOf | become rare
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text: All of the above: The World Health Organization maintains a goal of global eradication of polio, The last case of polio acquired in the United States occurred in 1979, and After polio became rare, the CDC recommended that the United States administer only IPV, and stop administering OPV, to eliminate the small risk of Vaccine Associated Paralytic Polio (VAPP).