Scientists investigate why some test positive for Covid-19 twice – The Wall Street Journal

The world is unlikely to be able to shake off the Covid-19 pandemic until many of us are immune to the deadly virus - either through vaccination or infection.
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The world is unlikely to be able to shake off the Covid-19 pandemic until many of us are immune to the deadly virus – either through vaccination or infection. This nasty virus is so new and unusual it's not even clear yet whether people who have contracted the disease can build up sufficient immunity to protect against a subsequent infection. As The Wall Street Journal points out, a laboratory test on monkeys suggests that there is optimism to believe that immunity can build with the spread of the disease. But it's still early days in the research, with concern about the presence of Covid-19 testing positive in people long after they appear to have recovered. – Jackie Cameron

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