Interoffice Correspondence from Dr Hans Kjellman, Woelm Pharma to CR Bishop, R Cabrera, U Kleist, A Knudson, I Regier, G Shneider, C Schott, H J Shroder and J Vanhalle, regarding T4/T8 ratios in haemophiliacs. Comments on an attached article from the Journal of the American Medical Association, which discusses What is the role of Factor VIII therapy in inducing helper suppressor ratio reversals in haemophiliacs.