Reply [a: Influenza A (H1N1) in cerebrospinal fluid sample and encephalopathy by Sandoval-Gutiérrez JM, Arcos M, Alva L, Volkow P, T Ferrari T, Quiñones F, Vázquez-Pérez J, Ormsby JE, Hanssen F, Reséndiz A, Alcántara P, Pérez Padilla R, Bautista E]