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Positive chemotaxis is movement toward the source of the chemical stimulus (along the chemical concentration gradient in air or water); negative chemotaxis is movement away from the source. The phenomenon is known to exist in a number of microorganisms and invertebrates.
A positive test for GBS in a healthy pregnant woman means that she is currently colonized with GBS and should be given antimicrobial agents intravenously during labor to prevent the transmission of the bacteria to the baby.This treatment is known as intrapartum prophylaxis. The recommended test for prenatal GBS screening is a culture of the vagina and rectum. 2  For this test, a swab of both sites is placed into a selective enrichment broth, which encourages the growth of any GBS present.