Hutachiona huri kwese kwese uye hwatekeshera kwemamiriyoni emakore. Hapana rudzi rwoupenyu runosiyiwa, kunyanya munhu. Kubva kuAIDS kuenda kuSARS (= yakakomba acute respiratory syndrome), kuburikidza nechibhokisi kana hepatitis C, hutachiona hwehutachiona hwakapedza huwandu hwevanhu uye hunogara huchimutsa njodzi yehutano. Zvimwe, zvisinei, zvinowanzoitika uye zvisingakuvadzi utano.

"Nyeredzi" dzechokwadi dzechando, furuwenza, gastroenteritis uye chikosoro chiri kutaura pamusoro pazvo panguva ino yegore. Chikumbaridzo chavo chedenda chinosvikwa zvine hurongwa mukati memwaka uno, unoratidzwa nekutonhora uye mwero wakaderera wezuva. Asi mamiriro ekunze anoita basa rei mukubuda kwedenda iri? Kune mamwe mavhairasi mumhepo here? Muviri wedu hauna kusimba zvakanyanya here?

Tisati tapindura mibvunzo yese iyi, tinofanira kuyeuka kukura kwakaita nyika yemavhairasi. Hazvizivikanwe kusvika pakupera kweXIX^stzana, zvichiri kunyanya kusaongororwa nhasi, nekuda kwekushaikwa kwehunyanzvi hwekushandisa. Muchokwadi, tsvakiridzo shoma yakaitwa pahutachiona hwemhepo, pamwe nemabatiro anoita masangano aya nemhoteredzo. Nekudaro, isu tinoziva kuti mamwe mavhairasi anotapurirwa zvakanyanya kuburikidza nemhepo, nepo kune vamwe, kubata ndiko kunosarudza. Izvi zvinonyatsotsanangurwa na virus morphology.

Chaizvoizvo, ese ane maitiro akafanana ekushanda: hutachiona hunopinda mumuviri, hunopinda musero, uye hunoburitsa genetic zvinhu mukati maro. Nyaya iyi inobva yamanikidza sero reparasiti kuita mazana emakopi ehutachiona hunozoungana mukati mesero. Kana paine mavhairasi akakwana, anobva musero achitsvaga dzimwe mhuka. Iko pano kwatinogona kuona musiyano mukuru pakati pemapoka maviri emavhairasi.