cold chain

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A method of protecting heat-labile sera, vaccines, antibiotics, and other biological preparations against exposure to high environmental temperatures in hot and tropical countries by preserving them in refrigerated containers until immediately before they are to be given to people in the target population. This is an essential feature of vaccination campaigns in hot regions, especially the tropics. The same methods and procedures operate in reverse to take specimens to regional laboratories.

Subjects: Public Health and Epidemiology.

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