Vaccines are not like other kinds of drugs, and comparatively speaking, they are hard to make. The production of the Lipitor you take for your cholesterol, the Metformin you take for diabetes, the Prozac you take for depression, or the Viagra you take for erectile dysfunction—all maintenance drugs of one kind or another—can be likened to building a Chevrolet on a General Motors assembly line. Production of a vaccine, on the other hand—particularly a new vaccine—is more like growing lettuce in a field in California. By the time the Chevy gets to your garage or the lettuce gets to your table,
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