Astudy out of the Harvard School of Public Health noted that some strains were harder to locate using a rapid test than others.
When Carl Berger got sick earlier this year, he figured he had COVID-19 because his wife had the virus.
"I think I had a headache and I generally felt kind of weak. I had contact with my wife, who is known to be positive - So I figured there was a good likelihood that I was positive," said Berger. A few days after that, both a rapid test and PCR came up positive for COVID-19. A study published by the Harvard School of Public Health, last April, noted that some strains were harder to locate using a rapid test than others.
"The delta variant was more difficult to detect, it had a higher limit of detection than omicron. This may relate to the omicron subvariants because some of the strains of the omicron subvariant do have mutations in the gene that's detected by the antigen test," said PhD candidate Sydney Stanley. "If we look at the original antigen tests that are out there, they just have data for the original Washington strain," said Dr. Kirby of the Harvard School of Public Health.
Health experts advise people who have symptoms to isolate until they get at least 3 negative rapid tests over the course of several days.
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