Home tests for Covid increasingly give a positive result for the presence of the virus only after about 4 days from the appearance of symptoms, while in the past the feared ‘red line’, indicating the disease, almost always appeared within 24 -48 hours from infection.
The new trend that confuses patients and increases the risk of contagion has been observed by various US experts, alarmed that in the midst of an increase in cases throughout the United States, infected people continue to leave their homes and meet people. The Centers for Disease Control and Prevention (CDC) themselves now recommend repeating the test several times after the onset of illness, even if the previous results were negative. According to Elizabeth Hudson, director of Kaiser Permanente’s infectious diseases division in California, this is due to partial immunity acquired in the last three years to the virus, either from previous infections, from vaccines or simply from having been exposed in the past to covid in the community. This is why today it can take several days for the Sars-Cov2 virus to replicate in the quantities necessary to be detected. The CDC reiterated that antigen tests done at home are not always reliable in case of negativity, while they are certain in case they give a positive result, and urge you to repeat them in the presence of symptoms or to go to the centers where the swabs are done PCR, reliable in 95% of cases.
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