Immunity Against SARS-CoV2 in Children and Their Parents / COVID-19

Inclusion Criteria: For hospitalized children or consulting at hospital * any child over 7 days old and under 17 years old in consultation or hospitalized for at most 4 days at AP-HP or CH Cayenne; Or any child over 7 days old and under 17 years old with a positive PCR at home, with an attending physician in a participating centre * Parent's agreement for blood, saliva and stool samples * Optional parent's agreement for nasopharynx swab * Optional parent's agreement for follow-up if PCR+ * With an Health insurance For children with potential COVID disease during the first wave * Any child over 7 days old and under 17 years, seropositive during the first wave * Or any child over 7 days old and under 17 years, with a previous inflammatory clinical disease potentially linked to SARS-cov2 * With an Health insurance Parent of the enrolled child * One parent of the enrolled child on ped-covid * Agreement for blood and saliva samples * Optional agreement for nasopharynx swab * Optional parent's agreement for follow-up if PCR+ * With an Health insurance For children SARS-coV2 positive * any child less then 18 years old * infected by SARS-coV2 * Parent's agreement for blood, saliva samples * Optional parent's agreement for nasopharynx swab * With health insurance For people living under the same roof of a child included in the study * any child or adult living under the same roof of a child SARS-coV2 positive and included in the study * With health insurance Exclusion Crite…