Letter from Peter Jones, Director of the Newcastle Haemophilia Centre, to Dr David Evans, Consultant Haematologist at the Royal Manchester Childrens Hospital. Thanks him for his letter dated 25th Feb and discusses concentrates being used derived from plasma that had not been donor tested. He states that they should not wait for an epidemic to occur but should make sure that the material they are using is covered by the thee methods they have of screening out the retrovirus.