When after coming into contact with somene who has group b strep do you test positive?

Why do you ask ?: Group b strep is occasionally found as a benign inhabitant of the GI tract & does create problems for newborns delivered to women who have it in their genital tract. Pregnant women go through transient periods where it is present & the disappears but rarely have any problem other than a UTI with it. It is not a germ known to cause waves of infection to people who are exposed.