<qa>  What is the name of the study that prospective women will be followed to evaluate the significance of the3. Prospective study- In addition to the above patients, women presenting from the beginning of the study for two years, with an isolation of GAS from the vagina even without overt disease, will be followed in order to evaluate the significance of such isolates. These isolates will be collected for comparison with surveillance cultures which will be taken in the future. Vaginal cultures and pharyngeal swabs will be taken every 2 months during the year. 