WASHINGTON: Testing people for COVID-19 too early in the course of infection may result in a false negative diagnosis, even though they may eventually test positive for the virus, according to a study which says it is best performed three days after the symptoms appear.
The review research, published in the journal Annals of Internal Medicine, assessed data on RT-PCR tests — which detect viral genetic material in samples — from seven prior studies.
In the analysis, the researchers from Johns Hopkins University in the US analysed a total of 1,330 respiratory swab samples from a variety of subjects including hospitalised patients.
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