Its surface's Hprotein circulates merely between the pig, is the humanity immune system has not seen to one kind of protein, is also the thing which flu must. the pig flu's gravity has in a big way?
其外表地H卵白仅仅在猪之间轮回,是人类免疫系统历来没有看到一种卵白,也是流感所必需地工具。
2
The virus only differs from H2N2 in one of its surface proteins, the h; since many people still have antibodies to the unchanged N2 protein, its effects are less severe.