1. Medicine Collegiate, Federal University of San Francisco Valley, Paulo Afonso, Brazil.
2. Molecular Genetics Laboratory, Department of Pathology and Forensic Medicine, School of Medicine, Federal University of Ceará, Ceará, Brazil.
3. São José Hospital of Infectious Diseases, Fortaleza, Brazil.
4. Department of Maternal and Child Health, School of Medicine, Federal University of Ceará, Ceará, Brazil.