*Department of Microbiology, Faculty of Medicine, Autonomous University of San Luis Potosi; †Department of Pediatrics; and ‡Department of Pathology, Hospital Central “Dr. Ignacio Morones Prieto.” San Luis Potosi, México. E-mail: email@example.com.
Accepted for publication April 16, 2014.
The authors have no other funding or conflicts of interest to disclose.