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Getting vaccines to rural and hard-to-reach areas is critical for public health and ethical reasons. Hector Roqueta Rivero/Moment via Getty Images

The cold supply chain can’t reach everywhere – that’s a big problem for equitable COVID-19 vaccination

So far, the only COVID-19 vaccines authorized for use need to be kept frozen. But there are many places in the world that can’t support a cold supply chain.

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