JACKSONVILLE, Fla. Doctors say COVID-19 reinfection is possible because, although you may build up immunity after the first infection, there is no guarantee that immunity to the virus is permanent. When it comes to studying COVID-19, Dr. Pauline Rolle of the Florida Department of Health in Duval County says the topic of immunity following a COVID-19 infection continues to baffle doctors treating the illness. Another baffling question is why some patients are experiencing COVID-19 symptoms well beyond the two-week quarantine period. According to Rolle, an extended period of COVID-19 symptoms is happing in every age group that gets infected. Its worth noting that because COVID-19 is constantly being studied by scientists all over the world, information about symptoms and immunity continues to evolve.