Re:Omicron variant more resistant to vaccine but causes less...
by 323 on Tuesday December 14, 2021 @11:52AM
(#29553867)
> I'm surprised we don't see Covid mutations that invalidate PCR tests
The people who design the tests know which parts of the sequence are more likely to mutate, so they pick the more conserved parts. Also, most PCR tests check for 3 different parts of the sequence. Which is why Omicron can still be detected even if there is a mutation in one part checked by the test, since the other 2 parts still match (the so called S-gene-dropout).
The people who design the tests know which parts of the sequence are more likely to mutate, so they pick the more conserved parts. Also, most PCR tests check for 3 different parts of the sequence. Which is why Omicron can still be detected even if there is a mutation in one part checked by the test, since the other 2 parts still match (the so called S-gene-dropout).