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?596Please respect copyright.PENANAJngwiQxMUR
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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。596Please respect copyright.PENANAzW2xbDNe3N
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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。596Please respect copyright.PENANA0uLL242rTW
(這不是食神劇情,而是確實新聞,Ref1)596Please respect copyright.PENANAR04VmURCgI
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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。596Please respect copyright.PENANAfz6a78pISs
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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)596Please respect copyright.PENANAsYXh8fYIQ7
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Capsule596Please respect copyright.PENANAUpiw9Iull1
防止細菌脫水596Please respect copyright.PENANAGzNoli874l
保護自己免被人類的吞噬細胞吞噬596Please respect copyright.PENANAd3bpUNeE9L
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Pili596Please respect copyright.PENANAb5c0sJekfm
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596Please respect copyright.PENANAaL4LXZnV5s
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Flagellum596Please respect copyright.PENANAEJUpxIZZ2y
會以螺旋槳的方式轉動,讓細菌可以隨意走動596Please respect copyright.PENANAfjmBv2dBtH
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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596Please respect copyright.PENANApkvNWbyWHH
https://www.penana.com/article/465358596Please respect copyright.PENANAB2OTfVWR5a
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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)。596Please respect copyright.PENANAD2uhpu4siT
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。596Please respect copyright.PENANAOlL6cGyemZ
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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。596Please respect copyright.PENANAyImnDh7FqA
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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。596Please respect copyright.PENANADiI77X2CJ2
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。596Please respect copyright.PENANA1kXluy2Mkt
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。596Please respect copyright.PENANA7o1SRz50Lx
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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。596Please respect copyright.PENANAEgZWF5UbmI
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。596Please respect copyright.PENANAkSu7eJQSbb
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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。596Please respect copyright.PENANAKiDo4eWWkh
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。596Please respect copyright.PENANAVsa2vqyRfF
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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......596Please respect copyright.PENANAuAWCHukXft
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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。596Please respect copyright.PENANAtK8t5ErtjC
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至少我都暫時未試過因為食生牛扒而肚瀉。596Please respect copyright.PENANAquo0wTsCWt
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(在摸著木塊下的情況寫下這句。)596Please respect copyright.PENANAsQ8YTGhw1C
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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。596Please respect copyright.PENANAausrsVsjgS
596Please respect copyright.PENANA0Scsp9HY1O
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/toc596Please respect copyright.PENANA6vLL5tfmbs
596Please respect copyright.PENANAuQhaUmZtzb
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。596Please respect copyright.PENANAb10XaLIlwu
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Link:596Please respect copyright.PENANAWfxn1IQb7h
https://www.penana.com/user/27349/%E8%96%AF%E4%BB%94%E8%81%9E%E8%8C%B1%E8%8E%89/portfolio596Please respect copyright.PENANAp5ruE8ZJcY
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有興趣接收科普資訊的話,歡迎follow IG: potatopigtongue。596Please respect copyright.PENANAMOMRK8mxKh
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科普專欄–薯不揀單
Author:
薯仔聞茱莉
ISSUE #22
<<深入淺出–生吃牛肉的潛在風險>>
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