It was confirmed by the World Health Organization that the outbreak of swine flu to be due to a new geneticstrain of H1N1.
猪流感的突然爆发基于H1N1的遗传基因产新变异，这是被世界卫生组织确认。
2
They found that the ability of the resistant bacteria to compete depended on the mutations they had acquired to become resistant, as well as their geneticstrain.
他们发现耐药结核杆菌与其他细菌竞争的能力，取决于它们所获得的耐药突变，以及它们的遗传品系。
3
An even higher dose killed all of the well-fed mice from a different geneticstrain but none of the starved mice, and again the mice that fasted regained their weight.