ʻO ka waikawa nukleika Yersinia Pestis

ʻO Yersinia pestis, i ʻike nui ʻia ʻo Yersinia pestis, hoʻohua koke a he kiʻekiʻe ka virulence, ʻo ia ka bacteria pathogenic maʻamau o ka maʻi ahulau i waena o nā ʻiole a me ke ahulau i waena o nā kānaka. ʻEkolu mau ala nui o ka laha ʻana: ①ka laha ʻana ma o ka ʻili: ka maʻi ma o ka ʻili i hōʻino ʻia a me nā membrane mucous ma muli o ka hoʻopili ʻana me ka sputum a me ka pus o ka mea maʻi i loaʻa ka bacteria, a i ʻole me ka ʻili holoholona, ​​​​ke koko, ka ʻiʻo, a me nā ʻōpala o nā ʻuku ahulau; ②ka laha ʻana ma o ke ala ʻai: ka maʻi ma o ke ala ʻai ma muli o ka ʻai ʻana i nā holoholona i haumia ʻia; ③ka laha ʻana ma o ke ala hanu: ka sputum i loaʻa ka bacteria, nā kulu a i ʻole ka lepo e pālahalaha ana ma o nā kulu hanu, e hoʻoulu ai i kahi maʻi ahulau i waena o nā kānaka. ʻEkolu mau maʻi ahulau nui o ke ahulau i ka mōʻaukala kanaka, ʻo ka mua ʻo "Plague of Justinian" i ke kenekulia 6; ukali ʻia e ka "Black Death" i pepehi i kahi kokoke i ka 1/3 o ka heluna kanaka ʻEulopa i ke kenekulia 14; Ua hoʻomaka ke kolu o ka maʻi ahulau ma ka Panalāʻau ʻo Yunnan, Kina i ke kenekulia 19, a laila ua laha ma ka hema o Kina a laha aku i Hong Kong a me ke ao holoʻokoʻa. I loko o kēia mau maʻi ahulau ʻekolu, ua nalowale aku ma mua o 100 miliona mau kānaka i ko lākou ola.