Rangarira ndima iri pasi apa uye ipapo pindura mubvunzo gare gare mumutauro mumwe chetewo sechikamu:  Kupfuura: Migumisiro yomuedzo womumunda yakaziviswa 12 April 1955 (gore rechigumi rokufa kwaPurezidhendi Franklin D. Roosevelt, uyo chirwere chake chokupera simba chaifungidzirwa kazhinji kazhinji kuva chakakonzerwa neporiyo). Mushonga weSalk wakanga uchishanda 60<unk>70% uchirwisa PV1 (poliovirus type 1), 90% uchishanda uchirwisa PV2 nePV3, uye 94% uchishanda uchirwisa bulbar polio. Nokukurumidza pashure pokunge mushonga waSalk watenderwa muna 1955, nhimbe dzokubaiwa majekiseni kuvana dzakatangwa. MuU.S., pashure pokurovedzwa kwavanhu vakawanda kwakasimudzirwa neMarch of Dimes, chiverengero chegore negore chezviitiko zvepolio chakaderera kubva pa 35 000 muna 1953 kusvika ku5 600 pakasvika 1957. Pakasvika 1961 mhaka 161 bedzi dzakanyorwa muUnited States. Vhiki imwe pamberi pezvi muna April 1955, Pierre Lépine paPasteur Institute muParis akazivisawo mushonga unobudirira weporiyo.  Mubvunzo: Mushonga wacho wakabatsira kuparadza chirwere chipi?
chirwere cheporiyo