New York — Abbott Laboratories shares surged in US trading on Monday after the company unveiled a coronavirus test that can tell if someone is infected in as little as five minutes, and is so small and portable it can be used in almost any health care setting.

The stock gained as much as 13% in New York, the biggest intraday gain since 2002. The shares were up 9.9% to $81.94 before  midday in New York...

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