| a longitudinal study of lancefield group a streptococcus acquisitions by a group of young dunedin schoolchildren. | paired saliva and pharyngeal cultures obtained on nine occasions over a 27-month period from a group of 103 young dunedin schoolchildren were tested for beta haemolytic lancefield group a streptococci. approximately 20% of the 858 pharyngeal cultures and 5% of the saliva cultures were positive. although group a streptococci were isolated at least once from 59 (57.3%) of the subjects, only seven cases of clinically apparent group a streptococcus pharyngitis were detected at the time of specimen t ... | 1990 | 2203999 |