For years, Kathleen McLaughlin smuggled American plasma every time she entered China, home to the world’s largest and deadliest blood debacle. She had no other choice.

By Kathleen McLaughlin

I started my decade-long turn as an international blood smuggler in 2004 with a mundane task: packing. I gently stacked a dozen half-liter glass vials into two soft-sided picnic coolers. The bottles held the components of a syrupy mix, a powerful medicine made from the immune system particles collected from thousands of people. A nurse would infuse the syrup into my veins, a treatment to keep my immune system under control, to halt its potentially paralyzing attacks on my nerves.