Cherechedza ndima iri pasi apa uye wozopindura mubvunzo unotevera mumutauro mumwe chete sezvinotaurwa mundima yacho: Passage: Nepo mavhairasi emiti nemabhakitiriya anogona kurimwa zviri nyore, mavhairasi emhuka anowanzoda mhuka mhenyu, izvo zvinonetsa kudzidza kwavo zvakanyanya. Muna 1931 zvakaratidzwa kuti hutachiona hwehutachiona hunogona kurimwa mumazai ehuku akaberekwa, nzira ichiri kushandiswa nhasi kugadzira majekiseni. Muna 1937, Max Theiler akakwanisa kurima hutachiona hweyellow fever mumazai ehuku uye akagadzira mushonga kubva kune yakaderedzwa hutachiona hutachiona; mushonga uyu wakaponesa mamirioni ehupenyu uye uchiri kushandiswa nhasi. Mubvunzo: Chii chinoda hutachiona hwemhuka kuti uongororwe?
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