In a paper published in Science, they confirm that the closest genetic relatives of the new virus are swine-flu strains from both North America and Eurasia.

《科学》杂志刊登的论文中，这些科学家确认，与新病毒基因关系最密切的是源于北美和欧亚大陆的猪流感病毒。

youdao

In short, I wanted to create a parents' guide to dealing with the swine flu that is based on the best science and my interviews with experts all over the country.

CNN: Dr. Gupta offers advice to parents on H1N1

Only when Centers for Disease Control and Prevention scientists sent a suspect sample to the mass spectrometer did they discover the new variety of swine flu, according to an article describing the techniques in Science magazine.

CNN: Commentary: Flu shouldn't close Mexico border