Vacuum-packed Foods Breed Deadly Bacteria
真空包装的食品可繁殖致命细菌
By Charles Q. Choi, Special to LiveScience
posted: 14 June 2007 07:00 pm ET

Those sealed glossy packs of cheeses and lunchmeat on your grocer's shelf can provide a particularly friendly home for nasty bugs that cause food poisoning, new research shows.
最新研究表明，食品店货架上摆放的密封包装的奶酪和午餐肉，能够为一种致病菌提供特别有利的繁殖环境。

Vacuum-packed foods are deprived of oxygen to keep them fresh and boost their shelf life, but the same strategy is a boon for Listeria monocytogenes, a bacterium responsible for a kind of food poisoning that kills 25 percent of the people it infects.
真空包装的食品和氧气隔离，从而保持新鲜并延长保质期，但这也为单核细胞增生性李斯特菌提供有利条件。 这种细菌导致的食物中毒能够令25%的感染者死亡。

Unlike many other food-borne germs, Listeria can grow even in the cold temperatures of refrigerators. The U.S. Food and Drug Administration notes that the microbe has been linked with foods such as raw milk; ice cream; soft-ripened cheeses such as feta, Brie and Camembert; hot dogs; raw and deli meats; raw vegetables; raw and cooked poultry; and raw and smoked fish.
与其他食源性细菌不同，李斯特菌可在冰箱中的低温下生长。美国FDA指出，可能滋生李斯特菌的食品有：生牛奶、冰淇淋、软质成熟干酪（如羊乳酪、布里白乳酪、Camembert乳酪）、热狗、生肉和熟肉、生菜、生（熟）禽肉、生雨和熏鱼。

In experiments with guinea pigs, Technical University of Denmark researchers found oxygen-deprived Listeria gets mean—up to 100 times more invasive than when grown with ample supplies of oxygen, findings which are detailed June 14 in the online journal BMC Microbiology.
丹麦技术大学在对葵鼠的试验中发现，无氧条件下的李斯特菌比氧气充足条件下生长的李斯特菌更可怕：侵袭能力高出100倍。他们的研究结果发表于journal BMC Microbiology。

The germ normally likes to live inside the oxygen-deprived gut, so it makes sense that it becomes more invasive under similar conditions, Licht said.
食品微生物学家Licht说，李斯特菌通常在缺氧的肠内生长，所以它在缺氧环境下侵袭能力更强。

"Avoiding vacuum packaging would lead to other problems with bacterial growth, so I'm not advocating that," food microbiologist Tine Licht told LiveScience. "But our work does help devise models predicting risk of food-borne disease."
“真空包装可避免其他细菌繁殖，所以我并不鼓励取消它”，Licht说，“但是我们的工作有利于建立食源性疾病的风险预报模型”。