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First-surface mirrors are now made for applications requiring a strict reflection without a ghosting effect as seen with a second-surface mirror, where a faint secondary reflection could be observed, coming from the front surface of the glass. This includes most optics applications where light is being manipulated in a specific manner.
When the country recorded its first two cases on 23 January 2020, it was among the first countries affected by COVID-19. [50] Two weeks later, only 150 cases had been reported outside mainland China; ten were in Vietnam, however, making it one of the top-ten affected countries.
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The first confirmed human infections were in Wuhan. A study of the first 41 cases of confirmed COVID‑19, published in January 2020 in The Lancet, reported the earliest date of onset of symptoms as 1 December 2019. [420] [421] [422] Official publications from the WHO reported the earliest onset of symptoms as 8 December 2019. [423]
The timeline of the COVID-19 pandemic lists the articles containing the chronology and epidemiology of SARS-CoV-2, [1] the virus that causes the coronavirus disease 2019 and is responsible for the COVID-19 pandemic. The first human cases of COVID-19 occurred in Wuhan, People's Republic of China, on or about 17 November 2019. [2]
The COVID-19 pandemic in Southeast Asia is part of the ongoing worldwide pandemic of coronavirus disease 2019 (COVID-19) caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). It was confirmed to have spread to Southeast Asia on 13 January 2020, when a 61-year-old woman from Wuhan tested positive in Thailand , making it the ...
The government of Vietnam prepared for the COVID-19 pandemic as early as the first cases in China emerged in December 2019, and pursued a zero-COVID strategy until September 2021. In January 2020, Vietnam's Prime Minister Nguyễn Xuân Phúc ordered measures to prevent and counter the spread of the disease into Vietnam, [ 1 ] as well as to ...