COVID-19 can be contracted from the remaining virus in the body

Cases of re-infection with COVID-19 are rare, so scientists cannot yet say for sure whether

They are associated with repeated infection or with the long-term presence of the same virus in the body.

At the same time, scientists observed a case of repeatedinfection in a patient with coronavirus four months later. They concluded that there were two separate episodes of infection in this case. The reason may be either re-infection due to weak immunity, or reactivation of the remains of the coronavirus in the patient's body.

The researchers believe that because so much time has passed since the initial infection, their patient had two separate episodes of infection. 

As the COVID-19 pandemic evolves,reports showing re-infection with SARS-CoV-2 is possible, so a positive SARS-CoV-2 RNA test does not necessarily indicate persistent shedding of the virus over an extended period of time.

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However, the US Centers for Control andDisease Prevention Control (CDC) believe that a positive coronavirus test within 90 days of initial infection is more likely to indicate sustained shedding of the virus, rather than reinfection.

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