Study of the Role of Regulator T Cells in the Pathophysiology of Childhood Henoch Schönlein Purpura

Inclusion Criteria

• •The child (with age- and comprehension-skill-appropriate information) and parents (or persons exercising parental authority) have been informed about the implementation of the study, its objectives, constraints and patient rights
• •The child (depending on age) and parents (or persons exercising parental authority) have given their free and informed consent and signed the consent
• •The patient must be insured or beneficiary of a health insurance plan
• •The diagnosis of Henoch Schönlein purpura was made by a physician according to the EULAR / PRES / PRINTO 2010 criteria (purpura predominantly on the lower limbs associated with one of the following criteria: abdominal pain, arthralgia or arthritis, kidney damage or suggestive histology (immune deposits dominated by Immunoglobulin A (IgA))
• •The patient is not treated via immunosuppression (steroids or other immunosuppressive / biotherapy) and has not been treated like this for at least 15 days
• •The diagnosis of Henoch Schönlein purpura was made by a physician according to the EULAR / PRES / PRINTO 2010 criteria
• •The patient has has a Henoch Schönlein purpura episode in the past, and no longer has any symptoms of the disease
• •The patient is not treated via immunosuppression (steroids or other immunosuppressive / biotherapy) and has not been treated like this for at least 15 days
• •Subjects free from infectious, inflammatory or autoimmune diseases
• •Candidates for elective surgery (circumcision, urological surgery, removal of tonsils and adenoids)