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Researchers, In What Is Known As Antigenic Imprinting, Have Stated That The First Type Of Early Childhood Influenza Virus That One Is Exposed To Dictates One’s Ability To Fight The Flu For The Rest Of One’s Live. This Could Help Access Risk, At Any Given Year, Based On One’s Age And The Dominant Virus At Birth.

New research establishes how first exposure to flu virus sets on our immunity for life | EurekAlert! Science News

https://www.eurekalert.org/pub_releases/2020-01/mu-nre013020.php

The first type of influenza virus we are exposed to in early childhood dictates our ability to fight the flu for the rest of our lives, according to a new study from a team of infectious disease researchers at McMaster University and Université de Montréal.