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Health & Safety
The world surpassed two sobering coronavirus milestones Sunday -- 500,000 confirmed deaths, 10 million confirmed cases.
The best evidence comes from patients themselves, and some experience a variety of symptoms long after their infections have cleared.
How long immunity lasts varies depending on the virus, and it's not yet known how long COVID-19 survivors might have that protection.
Trying to stay safe during a global pandemic is hard enough, but people in Southwest desert cities like Phoenix and Las Vegas are also trying to protect themselves from the brutal heat.
But medical workers, seen as possible sources of contagion, face another staggering challenge in these countries: the stigma associated with the illness.
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