The researchers have been working with relatives of the SARS virus -- one that causes the common cold in people and another that causes diarrhea in pigs.

• 研究者已经对非典病毒的同类家族病毒进行了研究。其中一种是引起人类普通感冒的病毒，另一种是引起猪类痢疾的病毒。