我們都知道口罩的防護力比疫苗的防護力即使不是「有過之而無不及」至少也是「難分軒輊，同樣重要」！
從台灣群聚感染的確診者來看，絕大多數的群聚是發生在面對面相處或共同生活，而有不佩戴口罩相處的對象，例如：家人或親密接觸者。
反之，確診者帶給社區的群聚感染，案例相對是比較少的，尤其是不明感染源的個案，接觸者匡列之後，陰性的比例還是比較高。
種種現象，讓官員和很多專家，紛紛認為口罩產生的影響力非常大，國人願意高度配合佩戴口罩，也是很重要的防護力來源！
但是畢竟我們沒有做相關的實驗研究。
今天要和各位分享的，是IPA組織和頂尖大學共同在孟加拉所做的一個實驗報告，實驗的結果顯示，口罩的防護力確實很重要。
戴口罩可降低COVID-19病毒傳播率
The Impact of Mask Distribution and Promotion
on Mask Uptake and COVID-19 in Bangladesh
(IPA創新貧困行動 https://reurl.cc/2or2MO)
越來越多科學證據顯示口罩可以預防Covid-19，但在現實生活中不確實或不長期配戴口罩的個體行為造成口罩的功效無法被證實。
IPA組織、耶魯大學和史丹佛大學共同合作，在孟加拉600個村莊設計推廣並發放口罩，同時評估社區戴口罩對Covid-19防疫的影響：
結論發現整體上，口罩推廣措施促使每一百人中有29人戴口罩，並減少9% Covid-19 有症狀的確診數。
外科口罩在阻斷有症狀的Covid-19傳播上特別有效，並將 60 歲以上群組的有症狀確診數減少 35%。
在接受口罩推廣導入的村莊中(實驗組)，口罩使用率增加 29% (從對比村落的 13% 增加到實驗村落的 42%)。清真寺的口罩使用量增加最多(37%)。
Overall, the core intervention induced 29 out of every 100 people to wear masks, increased physical distancing and reduced the number of people with symptomatic SARS-CoV-2 infections by 9 percent. Surgical masks were especially effective in reducing symptomatic SARS-CoV-2 infections and reduced symptomatic infections in people 60+ by 35 percent.
In villages that received the intervention, mask use increased by 29 percentage points (from 13 percent in the comparison villages to 42 percent in treatment villages). Mask use increased most in mosques (37 percentage points). A pilot and our scale-up activities suggest that in-person public reinforcement is a critical part of the intervention.
suggest that 在 I would only suggest that the force... - The British Academy 的推薦與評價
I would only suggest that the force of Levine's poem depends, in part, on his knowing the traditional forms – knowing enough to play against them. It's... ... <看更多>