In November 2002, mysterious pneumonia was detected by scientists in the Guangdong Province of China. The first case of this new type of pneumonia wasn't reported until February 2003, when it took only a couple of months to spread to more than 25 countries in Asia, Europe, and North and South America. This newly emergent pneumonia was labeled as "Severe Acute Respiratory Syndrome" (SARS), and its causative agent was identified as a previously unrecognized coronavirus (CoV), the SARS-CoV . Almost 10% of the roughly 8,000 infected people with SARS died. However, once the epidemic was contained, the virus appeared to "die out," and except for a few mild, sporadic cases in 2004, no additional cases have been identified. Now the question emerges that from where does this newly emergent virus come? And why did this viral disease disappear? Coronaviruses are large, enveloped viruses with posit...
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