evidence: JN.1, the now-dominant variant that accounts for nearly 86% of all circulating SARS-CoV-2 strains, may take longer to show a positive result on home antigen tests. [...] In March 2020, everyone was naive immunologically, he said, and "it took some time for the body to recognize the virus." Now, just a bit of virus may trigger an alarm by the immune system, with symptoms showing up quickly. These days, he said, "you may now feel sick at day zero instead of day 5." However, when you test within the first few days, there may not be a very high level of virus, so the home test, less accurate than the less-available PCR tests, probably won’t be positive. [...] For that reason, the sensitivity of home tests would be expected to be highest around the fourth day of symptoms, she said, although many people with symptoms might test positive earlier.