For Heather Suri, a registered nurse in Virginia, the race to vaccinate Americans against covid has thrown up some unprecedented obstacles.

The vaccines themselves are delicate and require a fair bit of focus over time. Consider Moderna’s instructions for preparing its doses: Thaw the vials for 2.5 hours in a refrigerator set between 36 and 46 degrees. Then rest them at room temperature for 15 minutes. Do not refreeze. Swirl gently between each withdrawal. Do not shake. Inspect each vial for particulate matter or discoloration.

And then there’s this: Once open, a vial is good for only six hours. As vaccines go, that’s not very long. Some flu vaccine keeps almost a month.

“This is very different, administering this vaccine. The process, it

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