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In a span of about 12 hours, three key events offered a glimpse of the public health calamity that was about to unfold. First, the World Health Organization officially declared the fast-moving outbreak a pandemic. Hours later, the NBA announced it was suspending its season. Minutes after that, Tom Hanks and his wife, Rita Wilson, said they had tested positive for the virus, becoming the first of many U.S. celebrities to share their diagnosis with the public.