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摘要: I read with interest the paper by Herzallah et al on first influenza pandemic of 21st century.1 In agreement previously published studies in Saudi Arabia,2,3 and worldwide,4,5 Al Hajjar McIntosh6 addressed usual age distribution A H1N1 infection. Infection was prevailing children young adults. The scarcity reported infection elderly might reflect their protection owing to exposure strains before 1957.1 This peculiar have implications implementing suitable management plans public health interventions.