Cold chain definition in community health nursing

A vaccine is, of course, a biological product. If it gets too hot or too cold (some vaccine formulations must be protected from freezing), the active ingredients can degrade and become less effective. Once a dose of vaccine is manufactured, it needs to be transported to immunization programs and clinics and health centers all over the world, and then remain viable until it’s needed. So, the vaccine cold chain is a global network of cold rooms, freezers, refrigerators, cold boxes, and carriers (like the one shown above) that keep vaccines at just the right temperature during each link on the long journey from the manufacturing line to the syringe. Most vaccines need to be kept cold but not frozen. It sounds simple enough in description but imagine carrying a cool glass of water across a desert—without freezing it, and without it heating up. Needless to say, in practice, the cold chain presents all kinds of challenges, especially when you’re trying to reach remote or rural communities or places where electricity is unreliable. At PATH, we work to address these challenges by supporting country-led technology integration into health systems and by developing new tools and devices that help extend the cold chain to every community that needs it. For example, to increase long-term vaccine storage and improve outreach to rural clinics and health centers, PATH evaluates and designs technologies and systems that can extend the cold chain beyond the power grid—like When vaccines are...

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