Inclusion Criteria:  (1) Patients of either sex, aged ≥18 years with (2) confirmed SARS-CoV-2 infection (according to the Austrian Federal Ministry of Social Affairs, Health, Care and Consumer Protection), (3) signed and dated declaration of consent by the patient according to ICH-GCP Guidelines, (4) being able to speak and understand the German language  Exclusion Criteria:  (1) Pre-existing dementia, (2) confirmed pregnancy, (3) patients without the capacity to consent, (4) asymptomatic patients, (5) patients not presenting to the hospital  Specific Inclusion/exclusion criteria for the MRI substudy  Inclusion criteria:  (1) Patients of either sex, aged ≥18 years with (2) confirmed SARS-CoV-2 infection (according to the Austrian Federal Ministry of Social Affairs, Health, Care and Consumer Protection), (3) signed and dated declaration of consent by the patient according to ICH-GCP Guidelines, (4) being able to speak and understand the German language (5) agree to participate for MRI  Exclusion criteria:  (1) Pre-existing dementia, (2) confirmed pregnancy, (3) patients without the capacity to consent, (4) asymptomatic patients, (5) patients not presenting to the hospital (6) definite contraindication to MRI (e.g. pacemakers)  Controls Patients after pneumonia (Cpneum) We will enrol at least 50 hospitalized age- and sex matched patients with pneumonia based on disease severity during the acute disease as: (group One) hospitalized (moderate; n=25) and (group two) severe patients admitted to the ICU for mechanical ventilation (n=25).  Inclusion criteria:  (1) Patients of either sex, aged ≥18 years with (2) bacterial pneumonia according to CDC criteria, (3) signed and dated declaration of consent by the patient according to ICH-GCP Guidelines, and (4) being able to speak and understand the German language, (5) agree to participate for MRI  Exclusion criteria:  (1) Pre-existing dementia, (2) confirmed pregnancy, (3) patients without the capacity to consent, (4) definite contraindication to MRI (e.g. pacemakers)  Healthy referents (Chealthy) Currently n=38 MRI acquisitions of prospectively recruited healthy individuals are available, fulfilling the criteria of this proposal (age- and sex matched; same MR protocol). This cohort will be prospectively extended by n=42 to reach age and sex matched criteria.