A single negative test result does not necessarily mean a person is not carrying the virus, as the specimen might have been collected at a very early stage of the infection.
The German chancellor is currently working from home in self-isolation after being informed late Sunday that a doctor who gave her a pneumococcal vaccination last Friday tested positive for the virus over the weekend.
As of Monday, Germany registered 22,672 confirmed cases and 86 deaths, according to the country's Robert Koch Institute.
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