Duba wurin da ke ƙasa sannan ka amsa tambayar daga baya a cikin harshe ɗaya kamar yadda wurin yake:  Passage: An sanar da sakamakon gwajin filin a ranar 12 ga Afrilu, 1955 (ranar cika shekaru goma da mutuwar Shugaba Franklin D. Roosevelt, wanda cutar shan inna ta kamu da cutar shan inna). Alurar rigakafin Salk ta kasance mai tasiri 60<unk>70% akan PV1 (nau'in poliovirus na 1), sama da 90% mai tasiri akan PV2 da PV3, da kuma 94% mai tasiri akan ci gaban bulbar polio. Ba da daɗewa ba bayan an ba da lasisin rigakafin Salk a 1955, an ƙaddamar da kamfen na rigakafin yara. A Amirka, bayan kamfen na rigakafi da ƙungiyar March of Dimes ta gabatar, adadin cutar shan inna a shekara ya ragu daga 35,000 a shekara ta 1953 zuwa 5,600 a shekara ta 1957. A shekara ta 1961 mutane 161 ne kawai suka kamu da cutar a Amirka.  Tambaya: Alurar riga kafi ta taimaka wajen kawar da wace cuta?
ƙwayar cuta