The immune response, including duration of immunity, to SARS-CoV-2 infection is not yet understood. Patients infected with other betacoronaviruses (MERS-CoV, HCoV-OC43), the genus to which SARS-CoV-2 belongs, are unlikely to be re-infected shortly (e.g., 3 months or more) after they recover. However, more information is needed to know whether similar immune protection will be observed for patients with COVID-19.