How to ask foreigners to do nucleic acid in English?

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The main purpose of nucleic acid testing is to exclude the possibility of novel coronavirus infection. Generally speaking, nucleic acid test is the gold standard for diagnosing novel coronavirus's disease. If the result of nucleic acid test is positive, it means that the patient is infected by novel coronavirus. If the result of nucleic acid test is negative, it is best to test again after 24 hours. If the result is still negative, the possibility of novel coronavirus infection is ruled out. It is suggested that the diet should be diversified at ordinary times, and at the same time, physical exercise should be appropriately increased to improve the body's immunity and reduce the chance of being infected by novel coronavirus to some extent.