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Andrew tested positive for coronavirus in March and then in September. What does reinfection mean for immunity and a vaccine? – ABC News

If coronavirus reinfection is possible, what does that mean for herd immunity — and a COVID-19 vaccine?

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When Andrew tested positive for coronavirus a couple of weeks ago, he was surprised.
Not because he thought he had taken all the right precautions to prevent catching it or the fact his symptoms were mild but because it wasn’t the first time he had received a positive COVID-19 test result.
The 34-year-old Australian expat, who lives in San Francisco, says he contracted coronavirus back in March after returning to the US from a friend’s wedding in Colombia.
On a connecting flight home from Mia…

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