inclusion criteria: * 60 post covid patients (6 months recovery after last negative pcr diagnosis) * patients will be selected using the oxford diagnostic criteria for cfs which required disabling fatigue to be the primary problem, in the absence of an exclusionary medical or psychiatric diagnosis. patients will fulfil the following criteria for cfs : * fatigue as a principal symptom. * fatigue definite onset that is not life long. * fatigue should have been present for a minimum of 6 months during which it was present for more than 50% of the time. * other symptoms may be present, particularly myalgia, mood and sleep disturbance. * both sexs will be included * body mass index range from (18.5 to 24.9 kg/m2) * patients' age range will be 18 to 34 years old . * presence of significant fatigue since covid-19. * able to understand and willing to sign a written informed consent document. * willing and able to complete study procedures.

inclusion criteria: * 60 post covid patients (6 months recovery after last negative pcr diagnosis) * patients will be selected using the oxford diagnostic criteria for cfs which required disabling fatigue to be the primary problem, in the absence of an exclusionary medical or psychiatric diagnosis. patients will fulfil the following criteria for cfs : * fatigue as a principal symptom. * fatigue definite onset that is not life long. * fatigue should have been present for a minimum of 6 months during which it was present for more than 50% of the time. * other symptoms may be present, particularly myalgia, mood and sleep disturbance. * both sexs will be included * body mass index range from (18.5 to 24.9 kg/m2) * patients' age range will be 18 to 34 years old . * presence of significant fatigue since covid-19. * able to understand and willing to sign a written informed consent document. * willing and able to complete study procedures.

inclusion criteria: 60 post covid patients (6 months recovery after last negative pcr diagnosis) patients will be selected using the oxford diagnostic criteria for cfs which required disabling fatigue to be the primary problem, in the absence of an exclusionary medical or psychiatric diagnosis. patients will fulfil the following criteria for cfs : fatigue as a principal symptom. fatigue definite onset that is not life long. fatigue should have been present for a minimum of 6 months during which it was present for more than 50% of the time. other symptoms may be present, particularly myalgia, mood and sleep disturbance. both sexs will be included body mass index range from (18.5 to 24.9 kg/m2) patients' age range will be 18 to 34 years old . presence of significant fatigue since covid-19. able to understand and willing to sign a written informed consent document. willing and able to complete study procedures.

inclusion criteria: 60 post covid patients (6 months recovery after last negative pcr diagnosis) patients will be selected using the oxford diagnostic criteria for cfs which required disabling fatigue to be the primary problem, in the absence of an exclusionary medical or psychiatric diagnosis. patients will fulfil the following criteria for cfs : fatigue as a principal symptom. fatigue definite onset that is not life long. fatigue should have been present for a minimum of 6 months during which it was present for more than 50% of the time. other symptoms may be present, particularly myalgia, mood and sleep disturbance. both sexs will be included body mass index range from (18.5 to 24.9 kg/m2) patients' age range will be 18 to 34 years old . presence of significant fatigue since covid-19. able to understand and willing to sign a written informed consent document. willing and able to complete study procedures.