According to the CDC, we don’t yet know if people with antibodies to SARS-CoV-2 are immune and if they are, how long any protection might last. While it’s rare, cases of reinfection of COVID-19 have been reported.
For 90 days after your positive test, you don’t need to quarantine if you’re identified as a close contact, and you shouldn’t participate in campus surveillance testing. You are, however, expected to follow all other campus guidelines.
The CDC is actively working to learn more about reinfection to inform public health action. They developed recommendations for public health professionals to help decide when and how to test someone for suspected reinfection. The CDC has also provided information for state and local health departments to help investigate suspected cases of reinfection.
At this time, whether you have had COVID-19 or not, the best way to prevent infection is to take steps to protect yourself.