Magungunan kiyayewa wani bangare ne mai tasowa, wanda ke nazarin dangantakar dake tsakanin lafiya dabbobi da wadanda ba na mutum ba da yanayin muhalli. Musamman, maganin kiyayewa shine nazarin yadda lafiyar mutane, dabbobi, da muhalli keda alaƙa da juna kuma abubuwan kiyayewa sun shafi su.[1] An kuma san shi da Lafiyar duniya, maganin muhalli, ilimin ƙasa na likita, ko maganin muhallu.[1][2]
Abubuwan dake haifar da matsalolin kiwon lafiya suna da rikitarwa, duniya, kuma ba a fahimta sosai ba. Masu aikin kiwon lafiya na kiyayewa sun kafa ƙungiyoyi masu yawa don magance waɗannan batutuwan. Ƙungiyoyin na iya haɗawa da likitoci da likitoci dabbobi da ke aiki tare da masu bincike da likitofi daga fannoni daban-daban, gami da masu ilimin microbiologists, pathologists, landscape analysts, marine biologists, toxicologists, epidemiologists, climate biologists, anthropologists, da kuma siyasa masana.[2]
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