Typical rickets were observed in a 13 year old Turkish girl and in a 14 year old Moroccan girl. Hypocalcaemia was present in one case. Symptoms have easily regressed with vitamin D2. Seric 25 OH D3 was very low; seric 1-25 OH D3 was normal before treatment and increased very much with vitamin D. In the second case vitamin D deficiency was familial. Study of 15 immigrant children living in or near Saint-Etienne has shown low seric concentrations of 25 OH D3 in 9 (8 undetectable).