Understanding the implications of SARS-CoV-2 re-infections on immune response milieu, laboratory tests and control measures against COVID-19.

Several months after the emergence of severe acute respiratory syndrome coronavirus-2 (SARS-CoV-2), cases of re-infection after recovery were reported. The extent and duration of protective immunity after SARS-CoV-2 infection is not fully understood. As such, the possibility of re-infection with SARS-CoV-2.

Ameloblastic carcinoma: a multicenter Nigerian study.

Purpose: To obtain a national profile on the prevalence and management of ameloblastic carcinoma in Nigerians.

Materials And Methods: Data were collected from the case files of patients with a histologic diagnosis of ameloblastic carcinoma from 4 tertiary referral centers in Nigeria from January 1980 to December 2008.

Results: Twenty patients were seen within the study period.