The United States has recorded the reemergence of the New World screwworm parasite in Texas and New Mexico, prompting state and federal emergency responses to mitigate livestock and economic risks.

美國記錄到新世界螺旋蠅寄生蟲在德克薩斯州與新墨西哥州重新出現，促使州與聯邦政府採取緊急應對措施，以降低畜牧業與經濟風險。

The current crisis is characterized by the detection of five confirmed cases of the New World screwworm, distributed across Texas and New Mexico. The USDA identified infestations in calves, a goat, and a dog. This biological incursion follows a multi-year northward migration of the parasite from South America and the Caribbean through Central America and Mexico. The susceptibility of the region is exacerbated by the parasite's preference for humid climates, with projections suggesting that rising global temperatures may increase the vulnerability of Gulf Coast states by 2055.

目前的危機特徵是在德克薩斯州與新墨西哥州偵測到五起確診的新世界螺旋蠅個案。美國農業部（USDA）在小牛、一隻山羊與一隻狗身上發現感染。此次生物入侵是由於該寄生蟲從南美洲與加勒比海，經過中美洲與墨西哥，歷時多年向北遷移所致。該地區因該寄生蟲偏好潮濕氣候而更易受影響，預測顯示全球氣溫上升可能會在2055年前增加墨西哥灣沿岸各州的脆弱性。

In response to these detections, Governor Greg Abbott activated the State Emergency Operations Center at Level II, centralizing a multi-agency effort involving animal health, agriculture, and public health officials. Concurrently, several Texas counties have declared local states of disaster, while some officials have petitioned for a national emergency declaration to secure additional resources. The administration's strategy emphasizes rapid detection and the deployment of all available state assets to prevent a systemic collapse of the livestock sector. This urgency is underscored by the parasite's biological mechanism: larvae consume living tissue, which can result in animal mortality if untreated.

針對這些偵測結果，州長 Greg Abbott 將州緊急行動中心啟動至第二級，集中由動物健康、農業與公共衛生官員組成的多機構協作。與此同時，德克薩斯州多個郡已宣布進入當地災難狀態，而部分官員已請願將其定為國家緊急狀態以獲取額外資源。政府的策略強調快速偵測並部署所有可用州資源，以防止畜牧業系統性崩潰。由於該寄生蟲的生物機制——幼蟲會食用活體組織，若不治療將導致動物死亡，這使得情況更為緊迫。

Institutional and economic implications are significant. The US beef industry has experienced a contraction to a 75-year low following the closure of the US-Mexico border to live cattle imports. Furthermore, the potential for supply chain disruptions in the top cattle-producing state could induce price volatility in protein products, a risk potentially compounded by external geopolitical instabilities affecting energy costs in the Strait of Hormuz. Internally, concerns have been raised regarding the USDA's operational capacity following a reported exodus of animal health specialists during previous administrative shifts.

制度與經濟影響顯著。由於美墨邊境禁止活牛進口，美國牛肉業已縮減至75年來最低點。此外，最大牛產州潛在的供應鏈中斷可能會引起蛋白質產品的價格波動，而荷姆茲海峽影響能源成本的外部地緣政治不穩定可能會加劇此風險。在內部方面，由於此前行政更替期間據報有動物健康專家流失，相關人士對美國農業部的運作能力表示擔憂。

International biosecurity responses have been swift. The Canadian Food Inspection Agency (CFIA) implemented temporary prohibitions on the import of livestock from Texas, requiring a 21-day absence from the state prior to entry. While the Canadian Cattle Association suggests that the limited volume of trade between Canada and Texas minimizes immediate disruption, the measure reflects a broader commitment to preventing the parasite's entry into Canadian territory, where cold winters are expected to inhibit the fly's survival.

國際生物安全反應迅速。加拿大食品檢驗局（CFIA）對從德克薩斯州進口的畜牧產品實施臨時禁令，要求在進入前必須離開該州21天。雖然加拿大牛業協會認為加拿大與德克薩斯州之間的貿易量有限，短期影響較小，但此措施反映了防止該寄生蟲進入加拿大領土的更廣泛承諾，預計寒冷的冬天將抑制該蠅類的生存。

The situation remains fluid as the USDA and state agencies continue surveillance and containment efforts to eradicate the parasite and stabilize the agricultural economy.

由於美國農業部與州政府部門持續進行監測與圍堵工作，以根除該寄生蟲並穩定農業經濟，情況仍處於流動狀態。