An sanar da sakamakon gwajin filin a ranar 12 ga Afrilu, 1955 (ranar cika shekaru goma da rasuwar Shugaba Franklin D. Roosevelt, wanda aka yi imanin cewa cutar shan inna ta haifar da cutar shan inna). Salk rigakafin ya kasance 60<unk>70% mai tasiri a kan PV1 (nau'in poliovirus na 1), fiye da 90% mai tasiri a kan PV2 da PV3, kuma 94% mai tasiri a kan 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 cikin Amurka, bayan kamfen na rigakafin rigakafin da aka inganta ta Maris na Dimes, yawan adadin cutar shan inna ta kowace shekara ya ragu daga 35,000 a 1953 zuwa 5,600 a shekara ta 1957. A shekara ta 1961 kawai an rubuta lokuta 161 a Amurka.
ƙwayar cuta