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The mysterious disappearance of the first SARS virus, and why we need a vaccine for the current one but didn't for the other

  • Written by Marilyn J. Roossinck, Professor of Plant Pathology and Environmental Microbiology, Pennsylvania State University
Visitors look at new anti-SARS outfits for medical workers on display Thursday Nov. 6, 2003 in Shanghai, China, as the country braced for a resurgence. The disease never made a comeback.AP Photo/Eugene Hoshiko

Some people question why the current coronavirus has brought the world to standstill while a previous deadly coronavirus, SARS, did not.

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