In the article “Prevention of Perinatal Group B Streptococcal Disease: Updated CDC Guideline” (July 1, 2012, page 59), the third to last sentence of the abstract (page 59) incorrectly stated that clindamycin is recommended in persons at serious risk of anaphylaxis if susceptibility is unknown. However, vancomycin, not clindamycin, is recommended in these persons. The sentence should have read: “For those at serious risk of anaphylaxis, clindamycin is recommended if the organism is susceptible, and vancomycin is recommended if there is clindamycin resistance or if susceptibility is unknown.” The online version of this article has been corrected.