inclusion criteria: * age 18 or above * capable to give informed consent * covid-19 infection confirmed by pcr test or a rapid antigen test (rat) with onset of at least three months * reports new onset or exacerbation of fatigue after onset of covid-19 and lasted for over two months * scoring 7 or above for the item "worst level of fatigue during the last 24 hours" in the brief fatigue inventory

inclusion criteria: * age 18 or above * capable to give informed consent * covid-19 infection confirmed by pcr test or a rapid antigen test (rat) with onset of at least three months * reports new onset or exacerbation of fatigue after onset of covid-19 and lasted for over two months * scoring 7 or above for the item "worst level of fatigue during the last 24 hours" in the brief fatigue inventory

inclusion criteria: age 18 or above capable to give informed consent covid-19 infection confirmed by pcr test or a rapid antigen test (rat) with onset of at least three months reports new onset or exacerbation of fatigue after onset of covid-19 and lasted for over two months scoring 7 or above for the item "worst level of fatigue during the last 24 hours" in the brief fatigue inventory

inclusion criteria: age 18 or above capable to give informed consent covid-19 infection confirmed by pcr test or a rapid antigen test (rat) with onset of at least three months reports new onset or exacerbation of fatigue after onset of covid-19 and lasted for over two months scoring 7 or above for the item "worst level of fatigue during the last 24 hours" in the brief fatigue inventory