Determination of GBS colonization rates in Pregnant Women insured with Maccabi Health Services, Doctors' Compliance Rates for Referral for Testing, test execution rates, and Early-onset GBS Disease (EOGBSD) Rates in Israel. Determine the relationship between conducting a GBS test in pregnant women and EOGBSD in Israel.

There have been few studies in recent years, which has prompted us to undertake this study. Our aim was to examine the current colonization rates and attack rates in the Israeli population. Our secondary aim was to evaluate the need to readjust recommendations towards universal screening.

Inclusion Criteria:

• All women with term pregnancies from 2015 to 2016 (until 20/9/16) insured by Maccabi Healthcare Services (MHS)

Exclusion Criteria:

• repeat pregnancies occurring in the same woman during the time period
• multiple pregnancies
• gestational age greater than 42 weeks due to probability of data inaccuracy
• women with missing information

Full-term pregnancies were defined as gestational age 37 weeks and above. Pregnancies were identified by a pregnancy code accessed by the primary physician indicating that the patient is pregnant, open pregnancy record in the medical record or child linked to the mother's id. Gestational age was defined by last menstrual period (LMP) or first obstetric ultrasound if LMP was unknown.We identified and excluded repeat pregnancies occurring in the same woman during the time period, multiple pregnancies, gestational age greater than 42 weeks due to probability of data inaccuracy and women with missing information.