Devices ranging from sophisticated sensors to heat-sensitive labels help ensure the fragile doses are maintained at the right levels in high-stakes supply chains

When several trays of the fragile Covid-19 vaccine shipped out last week were found to have fallen outside the specified temperature range, the incident put a spotlight on the increasingly sophisticated tracking devices that buttress the immunization effort.

Drugmakers and transportation companies are using an array of sensors, probes and heat-sensitive labels that track the thermal conditions inside shipments, recording small deviations to identify whether the precious cargo may have spoiled on the way.

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