inclusion criteria: 1. children aged 0-18 years 2. the child sought/needed primary or secondary medical care for covid-19 3. laboratory (rt-pcr, covid-19 antigen tests or sars-cov-2 antibody testing) or physician confirmed sars-cov-2 infection based on classic clinical symptoms and/or ground-glass opacification on ct imaging. 4. 28 days - 3 months from the onset of covid-19 symptoms 5. parent's/carer's/guardians consent to participate

inclusion criteria: 1. children aged 0-18 years 2. the child sought/needed primary or secondary medical care for covid-19 3. laboratory (rt-pcr, covid-19 antigen tests or sars-cov-2 antibody testing) or physician confirmed sars-cov-2 infection based on classic clinical symptoms and/or ground-glass opacification on ct imaging. 4. 28 days - 3 months from the onset of covid-19 symptoms 5. parent's/carer's/guardians consent to participate

inclusion criteria: children aged 0-18 years the child sought/needed primary or secondary medical care for covid-19 laboratory (rt-pcr, covid-19 antigen tests or sars-cov-2 antibody testing) or physician confirmed sars-cov-2 infection based on classic clinical symptoms and/or ground-glass opacification on ct imaging. 28 days - 3 months from the onset of covid-19 symptoms parent's/carer's/guardians consent to participate

inclusion criteria: children aged 0-18 years the child sought/needed primary or secondary medical care for covid-19 laboratory (rt-pcr, covid-19 antigen tests or sars-cov-2 antibody testing) or physician confirmed sars-cov-2 infection based on classic clinical symptoms and/or ground-glass opacification on ct imaging. 28 days - 3 months from the onset of covid-19 symptoms parent's/carer's/guardians consent to participate