科普專欄–薯不揀單 - <<深入淺出–生吃牛肉的潛在風險>>

普遍來說，雞肉和豬肉我們通常都會煮熟才吃，但牛肉就偏偏可以選擇幾成熟來品嘗，究竟點解呢？759Please respect copyright.ＰＥＮＡＮＡnt5TKztFST
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事實上，生吃食物始終會有一定風險，有機會導致食物中毒，純粹因為牛肉的風險相對比雞肉和豬肉較低，所以才有「生食」牛肉的選擇。759Please respect copyright.ＰＥＮＡＮＡPma5y7367F
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近在2020年6月，美國號令回收4萬三千磅牛肉，原因就是化驗證實那批牛肉含有令人腹瀉的大腸幹菌，老是在美國牛肉常出現的O157:H7品種。759Please respect copyright.ＰＥＮＡＮＡFJrqA65lcH
（這不是食神劇情，而是確實新聞，Ref1)759Please respect copyright.ＰＥＮＡＮＡ0QycELLlRn
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而自從90年代發現這品種後，美國規定牛肉出售前必須測量是否含有某幾種令人肚瀉的大腸幹菌。這一次為何能夠流出市面，那就不得而知了。759Please respect copyright.ＰＥＮＡＮＡdPU9pJH5K1
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在繼續講解之前，我們先以超簡略的方式認識一下細菌的外部構造。（圖2）759Please respect copyright.ＰＥＮＡＮＡYnZwTqaEEM
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Capsule759Please respect copyright.ＰＥＮＡＮＡLsi2wC8y1E
防止細菌脫水759Please respect copyright.ＰＥＮＡＮＡ9Z4Wle5HWf
保護自己免被人類的吞噬細胞吞噬759Please respect copyright.ＰＥＮＡＮＡ9qcx3eJCzy
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Pili759Please respect copyright.ＰＥＮＡＮＡlLYQSWSrB3
用來抓實接觸面，例如腸道壁膜，同時亦都可以用來幫助移動759Please respect copyright.ＰＥＮＡＮＡCiNSlhLyr0
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Flagellum759Please respect copyright.ＰＥＮＡＮＡMftrkTvUWo
會以螺旋槳的方式轉動，讓細菌可以隨意走動759Please respect copyright.ＰＥＮＡＮＡGJwRHQ1ZXE
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如有興趣想知道細菌和病毒的分別，可閱讀我之前所寫的文章759Please respect copyright.ＰＥＮＡＮＡx4czn42PaG
https://www.penana.com/article/465358759Please respect copyright.ＰＥＮＡＮＡRl2cdigcJs
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（圖3）令人腹瀉的大腸幹菌有好多種，而經常因為食用未煮熟的牛肉而出現在新聞的是Shiga toxin-producing E. coli (STEC)。759Please respect copyright.ＰＥＮＡＮＡmfmqg4odAB
顧名意義，它們能夠釋放Shiga toxin這有毒物質，而E coli則是大腸幹菌的簡稱。759Please respect copyright.ＰＥＮＡＮＡHlC1judX8s
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O157:H7品種，就是STEC的一種，潛伏期為2-3日。它們被曾證實可以逗留在外間土壤21個月有多，只有70度以上高溫才能確保徹底消滅它們。759Please respect copyright.ＰＥＮＡＮＡcsyppCy4uB
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它們最為麻煩的地方，就是能夠抵禦胃酸，有能力從胃部游走到腸道。759Please respect copyright.ＰＥＮＡＮＡVX97MdkMRq
到達腸道位置後，它們所釋放的Shiga toxin能夠對腸壁的細胞造成傷害，引致腹瀉及脫水。759Please respect copyright.ＰＥＮＡＮＡxj9Tf51Ws9
嚴重情況下更會引致溶血性尿毒綜合症(HUS)，對腎臟造成長久傷害。759Please respect copyright.ＰＥＮＡＮＡhf6chCpAkQ
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而最「令人意想不到」的是，此病絕對不可以用抗生素來醫治。759Please respect copyright.ＰＥＮＡＮＡToogNXohVw
因為用抗生素來傷害它們的話，只會導致更多Shiga toxin從它們身上釋出體外，適得其反。759Please respect copyright.ＰＥＮＡＮＡWINFAEOFhW
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通常情況下，醫生會抽取病人的糞便樣本，斷症腹瀉是否由STEC而起。759Please respect copyright.ＰＥＮＡＮＡgJ3fOuxmRj
如果屬實，可以做的方法就是盡量讓病人補充水份，避免脫水情況過於嚴重，並等待身體自我康復。759Please respect copyright.ＰＥＮＡＮＡmBfeZul9B1
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照這個情況來看，或者，侵侵吃Well Done牛排是有他的道理......759Please respect copyright.ＰＥＮＡＮＡ6ntl05Gm7R
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當然，如果牛肉來貨沒有問題，而處理上一切衛生措施做足的話，應該不會引起太大問題的。759Please respect copyright.ＰＥＮＡＮＡKtpNdEYrL9
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至少我都暫時未試過因為食生牛扒而肚瀉。759Please respect copyright.ＰＥＮＡＮＡHhlX7XiANi
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（在摸著木塊下的情況寫下這句。）759Please respect copyright.ＰＥＮＡＮＡgMV2VdTbRh
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如果想我快啲出文的話，請入去Penana網站科普專欄–薯不揀單俾一個like以及Bookmark，這對我非常之重要。759Please respect copyright.ＰＥＮＡＮＡNtO9bnheZI
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Link: https://www.penana.com/story/66244/%E7%A7%91%E6%99%AE%E5%B0%88%E6%AC%84-%E8%96%AF%E4%B8%8D%E6%8F%80%E5%96%AE/toc759Please respect copyright.ＰＥＮＡＮＡY4HvAin8JP
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同時亦可以在Penana網站裡按「買一嚿/半嚿薯仔」，以課金的方式推動我繼續搜羅資料寫文，多謝。759Please respect copyright.ＰＥＮＡＮＡwIZ5RvpimI
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有興趣接收科普資訊的話，歡迎follow IG: potatopigtongue。759Please respect copyright.ＰＥＮＡＮＡwxRTPXTAQF
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Ref1:

https://edition.cnn.com/2020/06/14/health/ground-beef-recall-e-coli-lakeside-refrigerated-trnd/index.html

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