Comparative Analysis of Anti-COVID-19 (Severe Acute Respiratory Syndrome) Humoral and Memory T Cell Responses in Children With Various Degrees of Immunosuppression:

"Depending on the weight of the child, between 5ml and 15ml of blood will be collected during a blood test necessary for the conventional care of the patient. A second blood sample will be taken one year later. The volume of blood taken does not exceed the volume allowed by the guideline Ethical considerations for clinical trials of medicinal products conducted in the paediatric population.~We will analyse:~1. Specific antibody responses (IgM, IgG, and immunoglobulin A (IgA) anti SARS-Cov-2) by quantitative chemiluminescence analysis.~2. Protective neutralizing capacity of these antibodies (neutralizing antibodies against SARS-cOV-2) by neutralization test.~3. SARS-Cov-2 specific memory T cell responses by multiparametric flow cytometry in order to characterize their maturation, differentiation, senescence, activation, secretion of interleukin (cytokines 2) , IFN-g, TNF) or Interferon-gamma (IFN-g) ELISPOT assay."