2021年6月9日，陝西省神木市紅堿淖國(guó)家級自然保護區發(f自船ā)生一起(qǐ)野禽H5N8亞型高緻病性又了禽流感疫情。爲了解該起(qǐ)疫情少風的發(fā)生經(jīng)過(guò)、可能(néng)來源了大、内部傳播方式以及對(duì)外擴散風險，組織開(kāi)展了流村工行病學(xué)調查。現場調查發(fā)現：5月27日該保護區電紙的黑頸䴙䴘種(zhǒng)群開(kāi)始發(fā)病死亡，28日保文司護區工作人員發(fā)現後(hòu)上報疫情，經(jīn林現g)國(guó)家禽流感參考實驗室确診爲H拍訊5N8亞型高緻病性禽流感疫情；截至6月26日，累計死亡黑頸䴙䴘5486隻冷相，未見其他鳥類及周邊家禽異常死亡。采小厭樣(yàng)檢測發(fā)現，野禽環境中病毒機醫污染面(miàn)較小，家禽中未檢出病原，家禽H5亞型禽流感免疫抗體水平城我較高。調查認爲：疫情由遷徙候鳥感染禽流感病毒傳入引起(qǐ)，發(fā)病局限會話于野禽；因紅堿淖水質堿性較強，病毒存活時(我黃shí)間較短，疫情經(jīng)湖水傳都輛播的風險性較小。疫情确診前，保護區已采取了知用無害化處理病死禽、消毒、人車管控等措施，當地農有計業農村部門對(duì)周邊家禽開(kāi)展了禽流感緊急疫情通農排查和強化免疫。因此，結合現場調查和實驗室檢測結果，推斷疫情由野報金禽向(xiàng)家禽擴散風險很低。本次疫情提示，玩風應多部門密切協作，持續做好(hǎo)高緻病性禽流感疫情監測嗎少工作，做到疫情早發(fā)現，果斷處置，以降低疫情擴散風險。
An Emergency Epidemiolog西近ical Investigation on an Outbreak o船服f H5N8 Subtype HPAI in Wild Birds i亮可n Shaanxi Province
On June 9，2021，an outb們這reak of H5N8 subtype highly pa來離thogenic avian influenza（HPA遠分I）occurred in wil能黑d birds in Hongjiannao Na家要tional Nature Reserve，Shenmu City，Shaan藍媽xi Province. In order to 刀件identify the occurrence，possible司年 sources，internal transmiss數開ion mode and risk of 謝美external spreading of音暗 the outbreak，an epidemiological invest厭小igation was organized. It was investi知房gated that，in the reserve，black 土民neck grebes started to sick and d鐵鐵ie of disease on May 27，which 放兵was found and reported on May 2筆相8，then confirmed as an醫花 outbreak of H5N8 HPAI by Nati藍小onal Avian Influenza Referenc影外e Laboratory；up to June 26，a total of 鐵大5 486 black neck greb房是es died，and no other birds and su去門rrounding poultry died abnormally. It 志綠was found that，by sampling and d和看etection，the virus報資 contamination was 懂民limited in the environment of w冷線ild birds，no pathogen w報暗as detected from poul師輛try，the level of antibody against H5 su水船btype avian influenza in pou河吧ltry was high. It was believed女年 that the outbreak was caused by the i到如ntroduction of avian influ畫窗enza virus with migratory birds裡商，and the occurren能科ce of the disease w熱為as limited to wild birds；as the wa體畫ter quality of Hongjiannao was a廠都lkaline，where the virus農知 could survive for short time，the risk 廠花of spreading via lake water wa學坐s low. Before any confirmation路門，the measures including biosa舞草fety disposal，dis線弟infection，management a件如nd control of persons and vehi謝刀cles were applied by the reserve，while房答 emergency screening and enhanc個頻ed immunization again答拿st avian influenza for surroun了頻ding poultry were condu呢還cted by local agricu志日ltural and rural departm農村ents. Therefore，i可信t was inferred that th匠雜e risk of spreading from wild birds日鐵 to poultry was very low a海外ccording to the re鐘醫sults of field investigation and la唱上boratory test results. It was市靜 recommended th唱姐at relevant departments shou好河ld closely cooper在開ate with each other to continuously mon現很itor HPAI，so as to ensure early warning讀鄉 and rapid response to reduce any師音 risk of spreading.
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