https://www.npr.org/sections/goatsandsoda/2018/04/04/599179621/a-novel-virus-killed-24-000-piglets-in-china-where-did-it-come-from (2018-4-4)
https://www.sciencenews.org/blog/science-ticker/new-coronavirus-killing-pigs-china (2018-4-4)
https://www.sciencedaily.com/releases/2018/04/180404133529.htm (2018-4-4)
https://www.youtube.com/watch?v=fxEhGKufqJE
