At the National Institute of Nutrition INN, of the 487 patients with symptomatology, only 8.8% were due to influenza A, subtype H1N1 virus; 9% to seasonal influenza and 82.2% was negative.
En el Instituto Nacional de Nutrición INN, de los 487 pacientes con sintomatología sólo 8.8% era por el virus de la influenza A subtipo H1N1; 9% estacional y 82.2% negativo.