这题目太夸张了，禽流感哪有那么可怕？

https://www.msn.com/en-us/health/other/cdc-confirms-fourth-human-case-of-infection-with-50-percent-mortality-rate-as-fears-rise-over-new-pandemic/ar-BB1ppcdA?item=flights%3Cimg%20src=&item=flights%3Cimg%20src=&item=flights%3Cimg%20src=&item=flights%3Cimg%20src=

鸟传牛，牛传人是主要途径。