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托福听力练习-科学美国人60秒:虱子叮咬引发过敏

2017-04-04 10:14:00来源：科学美国人60秒

点击查看>>科学美国人60秒音频：虱子叮咬引发过敏

　　科学美国人60秒听力练习：虱子叮咬引发过敏

　　科学美国人60秒英文文本

　　You've probably heard of peanut or shellfish allergies. But a meat allergy? Not as common. Even weirder is what might be causing it—tick bites, according to a study in the Journal of General Internal Medicine.

　　A few years back, folks started showing up in emergency rooms in the southeast U.S. with hives, swelling or worse—anaphylaxis—after eating red meat. For this study, researchers looked at three of those cases. And they found that tick bites, specifically those of the Lone Star tick, seem to be the cause.

　　The bitten victim’s immune system appears to become sensitized to a substance called alpha-gal. And whereas all the major food allergies are triggered by proteins, the culprit here—alpha-gal—is a carbohydrate.

　　Alpha-gal is found in the meat and fat of hooved mammals, like cows, sheep or pigs. So eating a burger can expose you to alpha-gal, which activates antibodies and leads to the release of histamines.

　　Researchers say something similar to alpha-gal in the tick saliva may set off the immune system—which then goes after the alpha-gal in meat. And leaves a steak lover ticked off.

　　中文翻译请点击下一页

本文关键字: 托福听力 科学美国人

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