1. Cold Chain System

2. Cold chain system Definition:
It is a system for distributing vaccines in a potent state from the manufacture to the actual vaccination site.
It consists of a series of transportation links during which adequate refrigeration is required to maintain the vaccine potency.
From site of manufacture  Air port  Central vaccine store  Regional vaccine store (governorate)  District store  Site of vaccination ( Health center or Health officer or Maternal Child Health center ) . 2 2

3. Cold chain system Components of cold chain system :
People : well trained to manage the cold chain system and organize the vaccine distribution .
Equipments : to store and transport vaccines .
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Public Health and Community Medicine Department Mansoura Faculty of Medicine

4. Cold chain equipment used in health facilities
1. Refrigerators

5. Characters of ideal refrigerator:
Put in a place away from direct sunlight (shaded place).
Put in ventilated area away from the wall  cm.
Have intact rubber insulation.
Have a thermometer inside.
Have a temperature chart to register temperature.
Have a person in charge to keep it well.
Be deforested if ice around the freezer more than ½ cm thick.
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Public Health and Community Medicine Department Mansoura Faculty of Medicine

6. 2.Cold boxes A cold box is an insulated container lined with ice-packs
to keep vaccines & diluents
cold during transportation and /or short period storage (from 2-7days).
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7. 3.Vaccine carriers
Vaccine carriers are insulated containers lined with frozen ice-packs, keep vaccines and diluents cold during transportation and/or temporary storage
(maximum for 48 hours with
the lid closed ) .
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Public Health and Community Medicine Department Mansoura Faculty of Medicine

8. 4. Foam pads A foam pad is a piece of soft foam
that fits on top of the ice packs in a
vaccine carrier
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Public Health and Community Medicine Department Mansoura Faculty of Medicine

9. 5.Ice-packs
Ice-packs are flat square plastic bottles filled with water and kept frozen.
Ice-packs are used to keep vaccines cool inside the vaccine carrier or cold box.
28 April 2017
Public Health and Community Medicine Department Mansoura Faculty of Medicine

10. Cold chain monitoring equipment used in health facilities
1. vaccine vial monitor
A vaccine vial monitor VVM is a label that changes in colour when the vaccine vial exposed to heat over a period of time.
Before opening a vial, the status of the VVM must be checked to see whether the vaccine has been damaged by heat.
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Public Health and Community Medicine Department Mansoura Faculty of Medicine

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Public Health and Community Medicine Department Mansoura Faculty of Medicine

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13. 2.Vaccine cold chain monitor card:
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15. How can you read the cold chain monitor card?
The monitor card contains chemical substances behind visible plastic rubber (window A, B, C, D) that change their color gradually and irreversibly with heat exposure.
How can you read the cold chain monitor card?
1- If windows A, B, C and D are all white  use the vaccine normally.
2- If windows A to C are completely blue, but window D is still white, it means that the vaccine has been exposed to temperature > 10°C but < 34° C for the following days:
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16. If window A only  2-3 day, if A & B  6-8 days if A, B & C 11-14 days (where A window is a monitor for the polio vaccine, B window for the measles vaccine and C window monitor for B.C.G- DPT- T.T and DT. vaccines).
You should use the vaccines within 3 months of change of its window indicator to the blue colour unless the expiry date of the vaccine requires a shorter period.
3- If window D is blue, it means that the vaccines have been exposed to a temperature > 34°C for at least 2 hours and you should test the cold chain (the clod chain has been broken).
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17. Health facility staff use dial or stem thermometers
to monitor the temperature of refrigerators
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Public Health and Community Medicine Department Mansoura Faculty of Medicine

18. How to load vaccines in a refrigerator ?
Vaccine refrigerators have two compartments:
A main compartment (the refrigerator): for storing vaccines & diluents, in which the temperature should be between 0°C and +8°C (thermostat is used to adjust the temperature).
The freezer: for freezing ice-packs. If the refrigerator is working properly, this section will be between -5°C and -15°C.
Public Health and Community Medicine Department Mansoura Faculty of Medicine
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19. Load a vaccine refrigerator as follows:
Freeze & store ice-packs in the freezer compartment.
All vaccines & diluents stored in the refrigerator compartment. If there is not enough space, diluents stored at ambient temperature ( but must be chilled by putting them in the refrigerator before use ) .
Put polio & measles vaccines in the top shelf under the freezer. (Excess amount of polio & measles vaccines could be kept in the freezer) .
Put B.C.G. vaccine in the middle shelf.
Other vaccines as TT, DT, DPT hepatitis B & diluents put in lower shelf.
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Public Health and Community Medicine Department Mansoura Faculty of Medicine

20. Separate different types of vaccine clearly.
Vaccine and diluents packed in rows with 1-2 cm in between (for air circulation). DPT, DT & TT  shouldn’t touch evaporator plate at the back (may freeze).
Separate different types of vaccine clearly.
Newest vaccine is put on the right, remove oldest one from the left.
Keep vials with VVMs showing more heat exposure than others in the box labelled "use first" .Use these vials first in the next session.
Put thermometer inside the refrigerator to adjust the temperature, check the temperature inside the refrigerator twice per day.
28 April 2017
Public Health and Community Medicine Department Mansoura Faculty of Medicine

21. Don’t store food & drinks in a vaccine refrigerator.
Put salt water bottles in the lower compartment of the refrigerator (help to keep temperature cool in case of a power cut).
Do not put vaccines on the door shelves (temperature is too warm to store vaccines.
Do not keep expired vaccines, NOR vaccines with VVMs reached or beyond discard point. NOR reconstituted vaccines for more than 6 hours in the refrigerator. Discard them immediately according to your national guidelines.
Don’t store food & drinks in a vaccine refrigerator.
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