Trucks filled with Covid-19 vaccine vials pulled out of Pfizer Inc.’s Kalamazoo, Mich., production plant on Sunday morning, part of one of the largest mass mobilizations since the country’s factories were repurposed to help fight World War II.
The effort to vaccinate the nation relies on chemists, factory workers, truck drivers, pilots, data scientists, bureaucrats, pharmacists and health-care workers. It requires ultracold freezers, dry ice, needles, masks and swabs converging simultaneously at thousands of locations across the country.
To work, every one of the many and complicated links of the chain has to hold.
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