RT Journal Article SR Electronic T1 Annual and seasonal variation in the frequency of beta-haemolytic streptococcal infections. JF Journal of Clinical Pathology JO J Clin Pathol FD BMJ Publishing Group Ltd and Association of Clinical Pathologists SP 594 OP 595 DO 10.1136/jcp.38.5.594 VO 38 IS 5 A1 C A Morris A1 D M Berry YR 1985 UL http://jcp.bmj.com/content/38/5/594.abstract AB