Peru is a South American country sharing borders with Bolivia, Brazil, Chile, Colombia, and Ecuador, with a heterogeneouslydistributed population of 28 million (average population density ,22 per km 2 ). The country is divided by the Andes Mountains in naturally distinct regions (highlands, coastal desert and jungle). All regions span the entire length of the country from latitude 3uS to latitude 18uS, and experience different influenza seasonal patterns in inter-pandemic years [13] . Perú is divided into 24 administrative departments composed of 196 provinces ranging in population size from 7000 to about 7.5 million people [17] .