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台北市長柯文哲於21日台北市防疫因應記者會中指出，在台北市的汙水下水道，檢測36次中有3次找到COVID-19病毒RNA，代表病毒仍會在糞便中存活。柯文哲也提醒，上廁所沖水時病毒可能會隨著看不見的氣溶膠顆粒汙染空間，因此沖水時應將馬桶蓋蓋上，才能避免汙染環境。

至於許多公廁採用蹲式馬桶，沖水時無法蓋上，柯文哲則建議上廁所一定要全程戴好口罩，並且如廁後勤洗手。
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MrOrz mark this message contains personal perspective
｜originally written by MrOrz
「下水道驗出新冠肺炎病毒」與「蓋上馬桶蓋再沖水」確實有各自的研究，但兩者之間沒有因果關係。

台灣與國外確實會透過污水監測，作為 COVID-19 是否在該社區盛行的指標之一，也可以幫助公共衛生相關的決策。

另外，也確實有研究指出，沖馬桶不蓋馬桶蓋確實會產生懸浮在空中的氣溶膠，上頭可能會帶有病原體；蓋上馬桶蓋之後，氣溶膠會稍微較少，但還是會由馬桶蓋與馬桶之間的縫隙中滲出。因此，研究者提出的解方是，應改善公共廁所的通風，避免氣溶膠累積。

Opinion Sources

【污水監測】
台灣的污水監測
https://www.bcc.com.tw/newsView.6412955
美國的污水監測
https://www.cdc.gov/healthywater/surveillance/wastewater-surveillance/wastewater-surveillance.html
澳洲的污水監測
https://www.health.nsw.gov.au/Infectious/covid-19/Pages/sewage-surveillance.aspx

【馬桶沖水】
2021/4/20 Flushing a public toilet? Don't linger, because aerosolized droplets do
https://www.sciencedaily.com/releases/2021/04/210420092847.htm

Flushing a public toilet? Don't linger, because aerosolized droplets do: Study explores flushing power to test risk of COVID-19 transmission

Because COVID-19 has been detected in urine and stool samples, public restrooms can be cause for concern. Researchers measured droplets generated from flushing a toilet and a urinal in a public restro

https://www.sciencedaily.com/releases/2021/04/210420092847.htm

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