Chemicals,plants and dead skin particles from animals can cause an allergic reaction.

VOA: special.2010.12.21

It's really just the result of the virus dividing within cells of your skin, and producing a lot of dead cells.

这便是病毒在皮肤细胞内部,分裂的结果,这个过程会产生大量的死亡细胞

耶鲁公开课 - 生物医学工程探索课程节选

It's really just the result of the virus dividing within cells of your skin, and producing a lot of dead cells.

这便是病毒在皮肤细胞内部,分裂的结果,这个过程会产生大量的死亡细胞

耶鲁公开课 - 生物医学工程探索课程节选