When Gey responded that HeLa cells had come from “a colored woman,” Gartler knew he’d found the source of the problem. “It seems to me the simplest explanation,” he told the audience, “is that they are all HeLa cell contaminants.” Scientists knew they had to keep their cultures free from bacterial and viral contamination, and they knew it was possible for cells to contaminate one another if they got mixed up in culture. But when it came to HeLa, they had no idea what they were up against. It turned out Henrietta’s cells could float through the air on dust particles. They could travel from one
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