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In recent months, Americans looking for eggs have faced empty shelves in their grocery stores. The escalating threat of avian ...

Hilleman was born a year after the notorious 1918 influenza pandemic swept the world ... the virus mutates slightly in a process called antigenic drift. The greater the mutation, the less likely ...

Hilleman, however, needed eggs not for his breakfast, but to make the vaccines that were key to stopping a potential influenza pandemic ... in a process called antigenic drift.

Hilleman, however, needed eggs not for his breakfast, but to make the vaccines that were key to stopping a potential influenza pandemic ... in a process called antigenic drift.

Hilleman, however, needed eggs not for his breakfast, but to make the vaccines that were key to stopping a potential influenza pandemic ... in a process called antigenic drift.

Each year, the virus mutates slightly in a process called antigenic drift. The greater the mutation ... Hilleman knew that it was just a matter of time before the influenza virus shifted and caused a ...