#Flash: Patients With Severe Covid Symptoms Mystified By Neg
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According to the scientists, it's not unlikely to experience all the bizarre ‘Covid, but not Covid’ cases. There can be false negatives and even the gold-standard test like PCR is known to be less than 100 % reliable. Research says that the timing of the test is the key and found that the accuracy dropped from 89% to 54% when patients waited longer than four days after the onset of symptoms to get tested. The severe symptoms aren’t caused by the virus itself, but the immune system’s extreme reaction to it and hence, sometimes tests continue to be negative,even when symptoms have long continued.

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