Lewkonia R M, Finn R
Br Med J. 1969 Aug 2;3(5665):268-9. doi: 10.1136/bmj.3.5665.268.
A disproportionate excess of blood group O was found in a circumscribed outbreak of serum hepatitis among patients and staff of a haemodialysis unit. The more severe cases were also mostly of group O. This suggests that host factors may be important in the genesis of this disease.