translated from Spanish: These athletes have repeated positive to Covid-19 tests, why?

Mexico.- The driver Sergio Pérez tested positive for Covid-19, something that caused him to miss the last two Formula One races because he failed to test negative in a second test. Meanwhile, Alexis Vega and Fernando Beltrán, players from Club Deportivo Guadalajara, were unable to play with the herd at the start of the Guardians 2020 tournament of the Liga MX for the same situation. Since athletes tested positive for coronavirus, they went through their confinement period, but in a second test it tested positive. What is the reason for this situation?
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Emmanuel Vazquez, cardiologist and specialist in Covid-19, made it clear that the isolation does not ensure that the infection lasts less and that in these cases it will depend on the viral load.
“There are two important problems: the first is that we don’t know about the virus because it’s new. So, there are patients whose infection may last longer. In my experience, I have patients who take a final test after 21 days and continue to test positive. What does it depend on? First, we know the disease and, second, how infected you were, the viral load,” said Vazquez Avila.

“If you got it because you hugged a boyfriend or kissed your girlfriend, there are several ways you may be exposed to the virus and viral load, the amount of virus that penetrates you. If you have a high viral load, the duration of infection will be longer. Confinement does not guarantee that your infection will last any longer. “Driver Sergio “Checo” Pérez expects a negative in his next Covid-19 test, which would allow him to return to the paddock with his Team Racing Point and compete in the Spanish Grand Prix, while footballers Alexis Vega and Fernando Beltrán were discharged, so they traveled with Guadalajara to today’s match in Ciudad Juárez against Bravos de Juárez.You could be interested : 
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Original source in Spanish