RT Journal Article SR Electronic T1 An epidemiological study of haemagglutination in hepatitis JF Journal of Clinical Pathology JO J Clin Pathol FD BMJ Publishing Group Ltd and Association of Clinical Pathologists SP 494 OP 496 DO 10.1136/jcp.15.6.494 VO 15 IS 6 A1 McArthur, James R. A1 Crowley, Nuala YR 1962 UL http://jcp.bmj.com/content/15/6/494.abstract AB An epidemiological study of 36 U.S. Marines living in a barracks and exposed to infectious hepatitis was made, and the ability of their sera to agglutinate day-old chick erythrocytes was found to be abnormally high in 52ยท8% of the group. The other groups of American Servicemen similarly exposed showed no such deviation from the normally expected incidence of raised titres. An unexplained, abnormally high incidence of raised titres was found in several control groups. The titres appeared to be unaffected to any significant degree by gamma globulin prophylaxis or yellow fever immunization.