The shorter time YMDD variant takes to become wild strain, the worse the prognosis will be.

YMDD变异株转变为野生株的时间越短，其预后可能越差。

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We used metabolic flux analysis (MFA) to probe the characters of wild strain and the mutant at mid-log-phase.

本文运用代谢通量分析的方法，分析和对比了分批发酵时出发菌株和突变株的代谢通量分布情况。

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After culture optimization, the enzyme production of the recombinant strain was 3 times higher than that of the wild strain.

优化培养条件后，此重组菌的发酵酶活单位明显高于野生菌，最高达野生菌的3倍。

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Another method of creating a candidate virus also mixes wild virus with a second, fast-growing strain, but instead of growing them in eggs, lets the viruses mingle in a special solution while scientists manipulate them through a complex technique called reverse genetics.

CNN: Candidate virus for H1N1 vaccine arrives at CDC

Some doctors paint a scary worst-case scenario: A flu pandemic breaks out and beats down the immune systems of millions of people, and then staphylococci--the hospital strain and the nastier variant in the community--run wild on a killing spree.

FORBES: Germ Warfare

Of the 50 patients and 33 wild armadillos the researchers analyzed from the U.S., 25 patients and 28 armadillos shared a genetically identical strain of leprosy bacteria.

CNN: Armadillos linked to leprosy in humans