Vaccines are a crucial tool in the fight against COVID-19, so it’s great news that the U.K. on Tuesday became the first country to begin mass inoculations using a new shot developed by Pfizer Inc. and BioNTech SE.

This vaccine and another developed by Moderna Inc. are set for early approval in the U.S. soon, and there are a handful of additional vaccines on the way. But even if they are as effective in the real world as they look in clinical trials, they can’t change the course of the pandemic overnight, and may not be able to entirely stop the spread of the virus. We need reinforcements.

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