The following is a summary of some recent studies on COVID-19. They include research that warrants further study to corroborate the findings and that has yet to be certified by peer review.
The researchers first performed these antigen tests on swab samples from 181 individuals with PCR-confirmed SARS-CoV-2 infections. Next, they took the virus from the swabs and tried to grow it in test tubes. When viral loads were below the antigen tests' level of detection, the virus particles were often incapable of growing.
People with low viral loads and negative antigen tests may become infectious "a day or two or three days later," said Dr. James Kirby of Beth Israel Deaconess Medical Center in Boston. "Therefore, to be most effective, antigen tests should be used immediately before an event or contact with those at greater risk from infection." The swabs must be collected for testing carefully, following the instructions provided with the testing kits, he added.
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