A cold chain is a refrigerated supply chain network that maintains the quality of temperature-sensitive products by keeping them within a specific low-temperature range during production, storage, and distribution. There are three types of cold chain packaging systems - active, passive, and hybrid - and the standard cold chain temperature for vaccine transport and storage is between 35°F and 45°F. In public health centers, an ice-lined refrigerator and backup generator are used at cold chain points to store vaccines and prepare frozen ice packs for maintaining the proper temperature range.

1. Cold chain
Description
A cold chain is a low temperature-controlled supply chain network. An
unbroken cold chain is an uninterrupted series of refrigerated production,
storage and distribution activities, along with associated equipment and
logistics, which maintain quality via a desired low-temperature range.

4. What are types of cold chain?
There are three basic types of cold chain packaging
systems available: active, passive and hybrid.
What is cold chain temperature?
The “Cold Chain” is the system of transporting and
storing vaccines within the temperature range of 35°F
(2°C) to 45°F (8°C). The cold chain begins when
vaccine is manufactured, moves through to the state
distribution center and ends with the local
immunization provider at the time of administration
What is cold chain in PHC?
ILR point or Cold Chain point: An ILR point or cold
chain point (CCP) is located at a health centre (usually
PHC/UHC/CHC) with an Ice Lined Refrigerator for
storage of vaccines and a deep freezer for preparation
of frozen ice packs. The cold chain point must have a
generator as power back up.