inclusion criteria: - patients with covid-19 infection confirmed by polymerase chain reaction of nasopharyngeal and oropharyngeal swabs to the causative agent of this infection - age from 18 to 75 years old from december 2020 to april 2021

inclusion criteria: - patients with covid-19 infection confirmed by polymerase chain reaction of nasopharyngeal and oropharyngeal swabs to the causative agent of this infection - age from 18 to 75 years old from december 2020 to april 2021