Some people carry group B streptococcus in their body but don't get
sick. Without knowing it, a woman who has group B streptococci in her birth
canal or in her colon can pass the bacteria to her baby during delivery,
causing the baby to develop
meningitis.
Meningitis caused by these bacteria also occurs in adults older than
60, especially those with long-term conditions such as diabetes, cancer,
alcohol dependence, and liver or kidney failure. Group B streptococci cause
meningitis in about 15% of the people who get bacterial meningitis in the
United States every year.1
New guidelines for prevention of group B streptococci have decreased
the incidence of disease; the guidelines include recommending prenatal
screening of all pregnant women at 35 to 37 weeks and giving antibiotics during
labor to women who have the bacteria.2