Reassortment is the viral equivalent of sex -- two viruses can meet and swap entire stretches of their genetic material .

这种重组对病毒来说相当于有性生殖-两种病毒有机会互换其全部的的遗传物质。

In these experiments , however , such " reassortment " wasn 't necessary for the mutant virus to change its transmissibility characteristics .

然而，在这些实验中，这样的“重组”以改变病毒的传播特性，不是必须的。

The virus is produced by a reassortment , in which human-adapted h1n1 swaps genes with an h2n2 bird flu .

这病毒是重组产生的，由人-适应h1n1与h2n2禽流感基因互换。

In that virus , one old surface protein , the h , was switched out for a new one in a process called reassortment . The strain went from h2n2 to h3n2 .

病毒中古老的表面蛋白h蛋白在重配过程中基因交换发生变异，这样病毒株就从h2n2型转变成h3n2型。