Ricardo F Mercado-Curiel, Héctor A Esquinca-Avilés, Rosalinda Tovar, Álvaro Díaz-Badillo, Minerva Camacho-Nuez and María L Muñoz*
* Corresponding author: María L Muñoz lmunoz@cinvestav.mx
BMC Microbiology 2006, 6:85 doi:10.1186/1471-2180-6-85