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368 pages, Paperback
First published March 14, 2017
This is a critical point in history. Time is running out to prepare for the next pandemic. We must act now with decisiveness and purpose. Someday, after the next pandemic has come and gone, a commission much like the 9/11 Commission will be charged with determining how well government, business, and public health leaders prepared the world for the catastrophe when they had clear warning. What will be the verdict?

We classify the type A influenza strains—the ones that cause influenza pandemics in both animals and humans—by the characteristics of two proteins on the virion’s surface: hemagglutinin (HA) and neuraminidase (NA). The hemagglutinin has the ability to bind with lung cells it comes in contact with, like a key fitting into a lock, and that is what starts the viral reproduction process. When the cell’s genetic machinery has churned out so many influenza virions that it’s full to bursting, it does burst, and the thousands of new virions move out to bind with other cells. The purpose of the neuraminidase is to allow those virions to escape the cell’s confines and spread to other cells, and even get expelled in the “wind of a cough.” The antiviral drugs that work against most influenza strains—oseltamivir (brand name Tamiflu) and zanamivir (Relenza)—work by obstructing the function of the NA, which is why they are called neuraminidase inhibitors. When we describe type A influenza viruses as H3N2, H1N1, or H5N2, we are referring to their HA and NA components. Technically we refer to influenza viruses by their type and HA and NA characteristics, such as A(H3N2). But for the type A viruses, the ones that cause influenza in humans and animals, we just shorten the name to the HA and NA components, for instance, H3N2. At present, we have identified eighteen distinct type A HA subtypes and eleven NAs, for a total of 198 possible combinations. The most recent pandemic, in 2009, was classified as H1N1—a descendant of the deadly 1918 strain.
Osterholm, Michael T.. Deadliest Enemy (pp. 255-256). Little, Brown and Company. Kindle Edition.