1. Department of Paediatrics, School of Medicine, Federal University of Bahia, Avenida Reitor Miguel Calmon, s/n, CEP 40110-100, Salvador, Bahia, Brazil
2. Institute of Tropical Pathology and Public Health, Federal University of Goiás, Goiânia, Goiás, Brazil
3. Department of Preventive Medicine, School of Medicine, Federal University of Bahia, Salvador, Bahia, Brazil
4. Bahiana School of Medicine and Public Health, Salvador, Bahia, Brazil
5. Central Laboratory of Bahia (LACEN), Salvador, Bahia, Brazil
6. Bacteriology Branch, Adolfo Lutz Institute (IAL), São Paulo, Brazil