Ubudlelwano phakathi kobisi lwenkomo kanye nokutheleleka kwendlebe okuphindaphindekayo ezinganeni kubhalwe phansi iminyaka engama-50. Nakuba kunezimo ezingavamile zamagciwane obisini abangela izifo ezindlebeni ngokuqondile (ngisho ne-meningitis), ukungezwani nobisi yikhona okuyinkinga kakhulu.
Eqinisweni, kunesifo sokuphefumula esibizwa ngokuthi i-Heiner's syndrome esihlasela izingane ngokuyinhloko ngenxa yokuphuza ubisi, okungaholela ekungenweni izifo ezindlebeni.
Nakuba ukungezwani komzimba ngokuvamile kubangela izimpawu zokuphefumula, zamathumbu, nezesikhumba, ngezinye izikhathi, esimweni esisodwa kwezingu-1, izingane zingase zihlupheke ngenxa yokulibaziseka kwenkulumo ngenxa yokuvuvukala kwendlebe okungapheli kwangaphakathi.
Kuye kwatuswa iminyaka engu-40 ukuzama ukususa ubisi ekudleni kwezingane ezinezifo zendlebe eziphindaphindayo izinyanga ezintathu, kodwa uDkt Benjamin Spock, cishe udokotela wezingane ohlonishwa kakhulu kunabo bonke, wagcina eyichithile inganekwane mayelana nezinzuzo nesidingo senkomo. ubisi.