Fact Check: Is Your RT-PCR False Negative Report Because Of Mutants?

“All possible sequences in the world are being checked regularly and there is no strain which can escape the double gene testing,” he said.

People should remember is that PCR has a sensitivity of 70 per cent. “The load of the virus in one’s mouth and nose remains the highest a day before the symptoms start showing. Then the virus load gradually decreases. If people get tested late after 7 to 8 days, it is possible to get a negative test report because the virus may have travelled inside the body,” he said.

Tests coming negative despite symptoms being present is not new and not because of any new strain. This was the case since the beginning, that if delays testing, the test results may come negative, Dr. Agarwal said.

Double mutant is a new strain formed by two mutated strains. In India, its presence has been found in many states, including Maharashtra and Delhi. E484Q and L452R strains have formed the double mutant.