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Another possibility is that the human coronavirus acquired genes from another, more virulent virus.
SARs is believed to be a type of RNA virus called a coronavirus .
The most frequently observed viruses were rhinoviruses followed by coronaviruses and respiratory syncytial virus.
The greatest benefit appears to be in detecting rhinoviruses, coronaviruses , and parainfluenza viruses.
Alternatively, it may have derived from one or more unidentified animal coronaviruses that only recently mutated or recombined to create a human pathogen, he says.
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