The Vaccine Race: How Scientists Used Human Cells to Combat Killer Viruses

Meredith Wadman

In 1962, Leonard Hayflick created and then froze roughly 800 tiny ampules of what he dubbed WI-38 cells. Each petite glass vial contained between 1.5 million and 2 million cells. Each cell in each vial, once thawed, had the capacity to divide another 40 times. Hayflick had created a supply of cells that...