Maternal β-Hemolytic Streptococcal Pharyngeal Exposure and Colonization in Pregnancy

Table 4

Frequency of throat isolation of -hemolytic streptococci in each pregnancy trimester and in total.

Lancefield group	Point prevalence (%)			Incidence (%)
	1st trimester	2nd trimester	3rd trimester
A	1 (0.8)	—	1 (0.8)	2 (1.6)
B	2 (1.6)	2 (1.6)	2 (1.6)	3 (2.4)
C	5 (4.0)	6 (4.8)	7 (5.6)	15 (11.9)
F	5 (4.0)	9 (7.1)	8 (6.4)	17 (13.5)
G	5 (4.0)	2 (1.6)	6 (4.8)	9 (6.3)
Total	18 (14.3)^a	19 (15.1)^a	24 (19.0)^a	43 (34.1)^a

^aSome subjects had more than one group isolated during the pregnancy.