A member asked:

Hi doctors. if you test positive for covid, can either the rapid test or the pcr test determine if it is omicron, delta, or a different variant?

3 doctors weighed in across 2 answers

Neither of these tests for variants. Sequencing of the viral RNA is needed for identification of variants. With increasing knowledge, nucleic acid probes can be developed to address variants.

Answered 12/3/2021

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Dr. Hunter Handsfield answered

Specializes in Infectious Disease

In a very recent report (released today or yesterday), it turns out that the standard PCR tests CAN almost automatically tell whether infection is due to the Delta variant (by far the most common in the US at present) and Omicron. As I understand it, most PCRs detect 3 genetic epitopes for Delta, but only 2 of them for Omicron. It's a simple step for the lab to know... [continued in comment]

Answered 12/5/2021

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