Group B Streptococcus carriers among HIV-1 infected pregnant women: prevalence and risk factors - Beitune, Patrícia El; Duarte, Geraldo; Maffei, Cláudia Maria Leite; Quintana, Silvana Maria; Silva, Ana Carolina Japur de Sá Rosa e; Nogueira, Antonio Alberto (European Journal of Obstetrics & Gynecology and Reproductive Biology, 2006)