The passengers were from at least 12 different countries, including from several states in the U.S. — including Arizona, California, Georgia and Texas, according to infectious disease experts and state public health officials. The goal of contact tracing is to alert people who might have been exposed, keep tabs on them in case they come down with symptoms and prevent them from spreading it to others. The process isn’t easy because people spend time with others, visit crowded places and travel.
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