TeachMeFinance.com - explain shift
shift The term 'shift' as it applies to the area of illness can be defined as ' The process in which the existing H (hemagglutinin) and N (neuraminidase) are replaced by significantly different H and Ns. These new H or H/N combinations are perceived by human immune systems as new, so most people do not have pre-existing antibody protection to these novel viruses. This is one of the reasons that pandemic viruses can have such a serve impact on the health of populations. See drift'.
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