inclusion criteria: age of respondents - 18 years and older. confirmation of sars-cov-2 infection by pcr hospitalized patient with covid-19, defined according to the following criteria (all of the following criteria must be present): radiological (x-ray of klp or tk klp) features of pneumonia, blood saturation (sao2) measured at rest in the absence of oxygen <95%, it is not necessary to apply on the day of patient enrollment: high-flow oxygen therapy or mechanical ventilation (non-invasive or invasive). time up to 10 days from the onset of covid-19 symptoms. the onset of covid-19 symptoms is the first day on which the first symptom typical for sars-cov-2 or covid-19 infection (in the opinion of the attending physician at the center) occurred, such as: fever, cough, shortness of breath, changes in taste or smell , muscle pain, chest pain, diarrhea, nausea, vomiting, sore throat, nasal congestion.

inclusion criteria: age of respondents - 18 years and older. confirmation of sars-cov-2 infection by pcr hospitalized patient with covid-19, defined according to the following criteria (all of the following criteria must be present): radiological (x-ray of klp or tk klp) features of pneumonia, blood saturation (sao2) measured at rest in the absence of oxygen <95%, it is not necessary to apply on the day of patient enrollment: high-flow oxygen therapy or mechanical ventilation (non-invasive or invasive). time up to 10 days from the onset of covid-19 symptoms. the onset of covid-19 symptoms is the first day on which the first symptom typical for sars-cov-2 or covid-19 infection (in the opinion of the attending physician at the center) occurred, such as: fever, cough, shortness of breath, changes in taste or smell , muscle pain, chest pain, diarrhea, nausea, vomiting, sore throat, nasal congestion.

inclusion criteria: age of respondents - 18 years and older. confirmation of sars-cov-2 infection by pcr hospitalized patient with covid-19, defined according to the following criteria (all of the following criteria must be present): radiological (x-ray of klp or tk klp) features of pneumonia, blood saturation (sao2) measured at rest in the absence of oxygen <95%, it is not necessary to apply on the day of patient enrollment: high-flow oxygen therapy or mechanical ventilation (non-invasive or invasive). time up to 7 days from the onset of covid-19 symptoms. the onset of covid-19 symptoms is the first day on which the first symptom typical for sars-cov-2 or covid-19 infection (in the opinion of the attending physician at the center) occurred, such as: fever, cough, shortness of breath, changes in taste or smell , muscle pain, chest pain, diarrhea, nausea, vomiting, sore throat, nasal congestion.

inclusion criteria: age of respondents - 18 years and older. confirmation of sars-cov-2 infection by pcr hospitalized patient with covid-19, defined according to the following criteria (all of the following criteria must be present): radiological (x-ray of klp or tk klp) features of pneumonia, blood saturation (sao2) measured at rest in the absence of oxygen <95%, it is not necessary to apply on the day of patient enrollment: high-flow oxygen therapy or mechanical ventilation (non-invasive or invasive). time up to 7 days from the onset of covid-19 symptoms. the onset of covid-19 symptoms is the first day on which the first symptom typical for sars-cov-2 or covid-19 infection (in the opinion of the attending physician at the center) occurred, such as: fever, cough, shortness of breath, changes in taste or smell , muscle pain, chest pain, diarrhea, nausea, vomiting, sore throat, nasal congestion.

inclusion criteria: 1. age of respondents - 18 years and older. 2. confirmation of sars-cov-2 infection by pcr 3. hospitalized patient with covid-19, defined according to the following criteria (all of the following criteria must be present): 1. radiological (x-ray of klp or tk klp) features of pneumonia, 2. blood saturation (sao2) measured at rest in the absence of oxygen <95%, 3. it is not necessary to apply on the day of patient enrollment: high-flow oxygen therapy or mechanical ventilation (non-invasive or invasive). 4. time up to 7 days from the onset of covid-19 symptoms. the onset of covid-19 symptoms is the first day on which the first symptom typical for sars-cov-2 or covid-19 infection (in the opinion of the attending physician at the center) occurred, such as: fever, cough, shortness of breath, changes in taste or smell , muscle pain, chest pain, diarrhea, nausea, vomiting, sore throat, nasal congestion.

inclusion criteria: 1. age of respondents - 18 years and older. 2. confirmation of sars-cov-2 infection by pcr 3. hospitalized patient with covid-19, defined according to the following criteria (all of the following criteria must be present): 1. radiological (x-ray of klp or tk klp) features of pneumonia, 2. blood saturation (sao2) measured at rest in the absence of oxygen <95%, 3. it is not necessary to apply on the day of patient enrollment: high-flow oxygen therapy or mechanical ventilation (non-invasive or invasive). 4. time up to 7 days from the onset of covid-19 symptoms. the onset of covid-19 symptoms is the first day on which the first symptom typical for sars-cov-2 or covid-19 infection (in the opinion of the attending physician at the center) occurred, such as: fever, cough, shortness of breath, changes in taste or smell , muscle pain, chest pain, diarrhea, nausea, vomiting, sore throat, nasal congestion.