Differential Diagnosis of Persistent COVID-19 by Artificial Intelligence

Persistent COVID group: Inclusion Criteria: * Age ≥18 and ≤70 years of age * Confirmed infection (PCR) with SARS- CoV-2 until 03/28/2022 and thereafter date. * Symptoms include: fatigue, respiratory distress or cognitive dysfunction, among others. * Symptoms persist or appear more than 3 months after onset of infection. * Symptoms last longer than 2 months and are not better explained by another diagnosis. * Symptoms appeared after initial recovery or persisted since disease debut. * Symptoms may fluctuate or remit over time. * Patients have capacity to consent and agree to participate in the study. Exclusion Criteria: * Active COVID-19 infection. * Cardiac arrhythmia, pacemaker carrier. * Other pathologies with dysautonomia. * Raynaud's phenomenon. * Other diseases that may affect exercise capacity or be aggravated by exercise shall also be excluded, such as: Uncontrolled heart failure, severe or symptomatic aortic stenosis, pulmonary edema, acute respiratory failure, recent pulmonary thromboembolism, lower limb thrombosis, infections, thyrotoxicosis, or orthopedic inability to walk. Recovery COVID group Inclusion Criteria: * Age ≥18 and ≤70 years of age * Confirmed infection (PCR) with SARS- CoV-2 until 03/28/2022 and thereafter date. * Full functional recovery. * Follow-up by Primary Care. * They have not presented three months after the onset of the disease: fatigue, respiratory distress or cognitive dysfunction, among others. * Patients have capacity to consent and agree to participate in the study. Exclusion Criteria: * Active COVID-19 infection. * Cardiac arrhythmia, pacemaker carrier. * Other pathologies with dysautonomia. * Raynaud's phenomenon. * Other diseases that may affect exercise capacity or be aggravated by exercise such as: uncontrolled heart failure, severe or symptomatic aortic stenosis, pulmonary edema, acute respiratory failure, recent pulmonary thromboembolism, lower limb thrombosis, infections, thyrotoxicosis, or orthopedic inability to walk shall also be excluded.