Wanasayansi wamegundua kwamba nzi hubeba viini vingi vinavyosababisha magonjwa kuliko ilivyodhaniwa awali.
Nzi wa kawaida wanaopatikana nyumbani na nzi wanaopatikana sana kwenye mizoga huwa na bakteria zaidi ya aina 600, uchunguzi wa DNA umebaini.
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