- The patient was diagnosed with symptomatic COVID-19, confirmed by a positive PCR for SARS-CoV-2, another positive NAAT test (RT-PCR, LAMP, TMA or mPOCT), positive SARS-CoV-2 serology, a positive Antigen test or CORADS 4 or 5 on CT-scan, - The patient is 3 up to and including 12 months after being diagnosed with COVID-19 or after hospital discharge in case the patient was admitted,- The patient experiences severe levels of fatigue (= 35 on the fatigue subscale of the Checklist Individual Strength [CIS-fatigue]). The severe fatigue started with or increased substantially directly after the onset of symptoms of COVID-19,- The patient reports physical disability (= 65 on the Rand36 physical functioning subscale) and/or social disability (= 10 on the Work and Social Adjustment Scale [WSAS]),- The patient is 18 years of age or older,- The patient has sufficient command of the Dutch language.

- The patient was diagnosed with symptomatic COVID-19, confirmed by a positive PCR for SARS-CoV-2, another positive NAAT test (RT-PCR, LAMP, TMA or mPOCT), positive SARS-CoV-2 serology, a positive Antigen test or CORADS 4 or 5 on CT-scan, - The patient is 3 up to and including 12 months after being diagnosed with COVID-19 or after hospital discharge in case the patient was admitted,- The patient experiences severe levels of fatigue (= 35 on the fatigue subscale of the Checklist Individual Strength [CIS-fatigue]). The severe fatigue started with or increased substantially directly after the onset of symptoms of COVID-19,- The patient reports physical disability (= 65 on the Rand36 physical functioning subscale) and/or social disability (= 10 on the Work and Social Adjustment Scale [WSAS]),- The patient is 18 years of age or older,- The patient has sufficient command of the Dutch language.

- The patient was diagnosed with symptomatic COVID-19, confirmed by a positive PCR for SARS-CoV-2, positive SARS-CoV-2 serology or CORADS 4 or 5 on CT-scan, or had typical symptoms and was part of a household in which another person was tested positive by PCR 2 weeks before or after the first day of illness,- The patient is 3 up to and including 9 months after being diagnosed with COVID-19 or after hospital discharge in case the patient was admitted,- The patient experiences severe levels of fatigue (= 35 on the fatigue subscale of the Checklist Individual Strength [CIS-fatigue]). The severe fatigue started with or increased substantially directly after the onset of symptoms of COVID-19,- The patient reports physical disability (= 65 on the Rand36 physical functioning subscale) and/or social disability (= 10 on the Work and Social Adjustment Scale [WSAS]),- The patient is 18 years of age or older,- The patient has sufficient command of the Dutch language.

- The patient was diagnosed with symptomatic COVID-19, confirmed by a positive PCR for SARS-CoV-2, positive SARS-CoV-2 serology or CORADS 4 or 5 on CT-scan, or had typical symptoms and was part of a household in which another person was tested positive by PCR 2 weeks before or after the first day of illness,- The patient is 3 up to and including 9 months after being diagnosed with COVID-19 or after hospital discharge in case the patient was admitted,- The patient experiences severe levels of fatigue (= 35 on the fatigue subscale of the Checklist Individual Strength [CIS-fatigue]). The severe fatigue started with or increased substantially directly after the onset of symptoms of COVID-19,- The patient reports physical disability (= 65 on the Rand36 physical functioning subscale) and/or social disability (= 10 on the Work and Social Adjustment Scale [WSAS]),- The patient is 18 years of age or older,- The patient has sufficient command of the Dutch language.