Mina said, because rebound cases can be contagious. If you have symptoms within that time frame, you should test, Dr. In general, people who experience Paxlovid rebound will have a resurgence of symptoms between two and eight days after they recover, Dr. Paxlovid rebound occurs in a minority of cases (it’s also possible to have a return of Covid symptoms even if you didn’t take an antiviral). If you’re symptomatic, two tests may be sufficient. recommends testing at least three times after exposure, 48 hours apart. Heba Mostafa, director of the Molecular Virology Laboratory at the Johns Hopkins Hospital. You need to test again, typically 48 hours after the first test, depending on the instructions that come with your particular at-home test, said Dr. “If I’ve got an active symptom, I’ve got a runny nose, and then I test and it’s negative, I can be more sure that it actually is a true negative,” he said.īut one negative rapid test doesn’t mean you’re in the clear. Prabhat Jha, a professor of global health at the University of Toronto. Rapid tests are most reliable when you have symptoms, said Dr. He estimated that roughly 30 percent of people test positive within three days after an exposure, another 30 to 50 percent within five days after, and about 20 percent test positive around day six or seven. There’s “wide variation” in when people test positive on a rapid test, Dr. It’s also possible to first test positive after the five-day mark. “Especially people who have been recently boosted,” he said, “if they get infected, they might become symptomatic 24 hours post-exposure, 48 hours post-exposure - really fast.” Michael Mina, a former Harvard epidemiologist who is now the chief science officer for eMed, a telehealth company. Symptoms also might come on sooner for people who have been vaccinated and previously infected, said Dr. The more immunity you’ve built up, the more subtle the symptoms often are, Dr. While symptoms are a good indicator that you have Covid, there are still large swaths of people who get infected and never show any signs, he added. If you have to spend time with someone who is immunocompromised or otherwise more vulnerable to the virus, like an older relative, consider testing before coming into contact with them, Dr. You should isolate as much as you can while waiting, and wear a mask when you are around other people. says to wait at least five days before testing because swabbing too early can give you a false negative. If you were exposed to Covid and don’t have symptoms, the F.D.A. Peter Chin-Hong, an infectious disease specialist at the University of California, San Francisco. Symptoms can include a runny or stuffy nose, fatigue, headaches, brain fog, sneezing or coughing, said Dr. If you have Covid symptoms and someone you had been spending time with is now positive, test immediately. And always make sure the control line - which typically appears next to the “C” - shows up when you use a rapid test otherwise, the test may be damaged or faulty. If a test is delivered to you on a sweltering day, for example, the agency recommends bringing the package inside and waiting at least two hours before opening it. According to the F.D.A., at-home tests work best when you use them in an environment that’s between roughly 59 to 86 degrees Fahrenheit.
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