1. Departament of Microbiology, School of Biological Sciences, Autonomous University of Nuevo Leon, Avenida Pedro de Alba, San Nicolás de los Garza, Mexico.
2. Department of Infectious Diseases, University Hospital “Dr. José E. González” and School of Medicine, Autonomous University of Nuevo Leon, Avenida Madero S/N esq Avenida Gonzalitos, Mitras Centro, Monterrey, Mexico.