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pcr and antibody antigen tests are used to detect covid19 , two cases for each test...

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Medical Sciences

pcr and antibody antigen tests are used to detect covid19 , twocases for each test where you might get negative result forinfected person, what are these cases?

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Two cases for PCR testing for negative results for infected person 1The sample collection from the nasal cavity is difficult some times and cant collect the enough genetic material of virus to detect in RT PCR    See Answer
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