See related story: Superspreaders May Hold SARS Clue
Slideshow: Superspreaders May Hold SARS Clue
Severe acute respiratory syndrome continues to mystify researchers. SARS "superspreaders" may be to blame for its rampant spread, but some doctors say not enough is known about the disease to determine whether such carriers exist. By Kristen Philipkoski.
In Singapore, the SARS epidemic has mushroomed from original contacts with just five patients. This chart shows how it spread from those five.Center for Disease Control and Prevention.
