Even though there exists only little clinical evidence about people catching COVID-19 again, scientists suggest that there can be multiple meanings of what reinfection could mean, making us understand as to why this could happen
A probable reason for this could be the fact that once a person recovers from the infection, the viral load in the body depletes. In some cases, a recovered patient could go on to have low levels of virus in the body and hence, make them prone to show symptoms and get reinfected.
The viral load could persist in the body for up to three months time, which is the duration which most people who get reinfected were diagnosed with. However, scientists believe that a positive diagnosis for the second time, post complete recovery is not a case of reinfection but virus shedding due to leftover traces of virus left in the body.