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The causal factor may be related to clostridia and bacillusgasoformans infections.

其病因可能与梭状芽胞杆菌和产气杆菌感染有关。

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H. pylori infection is recognized as a causal factor in the pathogenesis of chronic gastritis, peptic ulcer, gastric cancer, and gastric MALT lymphoma.

幽门螺杆菌感染被认为是慢性胃炎、消化性溃疡、胃癌和胃malt淋巴瘤发病机制中的一个必然因素。

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With a ferocity not seen since Hurricane Katrina, the alarmists are taking every opportunity to sell the notion that global warming was a significant causal factor behind the unusually strong tornadoes.

FORBES: Alarmists Offer A Perfect Global Warming Challenge

One can easily overcomplicated this disease or oversimplify it (in the case of the amyloid hypothesis), but there is often one causal factor (bacteria, virus, peroxynitrite, etc.) that explains the great majority of diseases and once you identify that factor and how to neutralize it, then you can successfully treat the disease.

FORBES: The Lessons Of Failure: What We Can Learn From Bapineuzumab's Blowup