Tirohia te wāhanga i raro nei, kātahi ka whakautu i te pātai i muri mai i te reo kotahi me te wāhanga:  Passage: Ko te kano ārai mate polio whai hua tuatahi i hangaia i te 1952 e Jonas Salk me tetahi roopu i te Whare Waananga o Pittsburgh i uru atu ki a Julius Youngner, Byron Bennett, L. James Lewis, me Lorraine Friedman, e hiahiatia ana mo nga tau o nga whakamatautau i muri mai. I haere a Salk ki te reo irirangi CBS ki te ripoata i tetahi whakamatautau angitu i runga i tetahi roopu iti o nga pakeke me nga tamariki i te 26 o Poutu-te-rangi 1953; e rua nga ra i muri mai, i whakaputaina nga hua ki JAMA. I te timatanga o te 23 o Hui-tanguru 1954, i whakamatautauria te kano kano i te Kura Tuatahi o Arsenal me te Whare Watson mo nga Tamariki i Pittsburgh, Pennsylvania. I whakamahia te kano a Salk i roto i te whakamatautau i huaina ko te Francis Field Trial, i arahina e Thomas Francis, te whakamatautau rongoa nui rawa atu i roto i te hitori i taua wa. I tīmata te whakamātautau ki te 4,000 tamariki i te Kura Tuatahi o Franklin Sherman i McLean, Virginia, ā, i te mutunga, e 1.8 miriona ngā tamariki, i ngā kāwanatanga e 44, mai i Maine ki California. I te mutunga o te rangahau, tata ki te 440,000 i whiwhi i te werohanga kotahi, neke atu rānei o te kano ārai mate, tata ki te 210,000 ngā tamariki i whiwhi i tētahi placebo, i ahu mai i ngā pāpāho ahurea harakore, ā, 1.2 miriona ngā tamariki kāore i whiwhi i te werohanga, ā, i noho hei rōpū whakahaere, ka tirohia mēnā ka pāngia e tētahi o rātau te mate polio.  Pātai: I te mutunga, e hia katoa ngā tamariki i whai wāhi ki te whakamātautau?
1.8 miriona ngā tamariki