Do you remember the contagious SARS virus, which is widespread around the world in 2003? At that time, the medical experts recommended every one to wear the N95 masks so as to prevent infection. Therefore, N95 masks were widely used in China, Hong Kong, Vietnam, and Toronto, Canada during outbreaks of the SARS virus. After that, when there are infectious diseases such as the 2007 avian bird flu pandemic in Japan or the 2009 H1N1 flu outbreak in the United States and Mexico City, people have b...


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