Ewan McGregor is on a mission to the ends of the earth to immunise some of the hardest-to-reach children in the world, following two vaccine trails, or 'cold chains', supported by Unicef
2/2 Ewan McGregor journeys up the River Congo following a vaccine trail supported by Unicef.
See all previous episodes from Ewan McGregor: Cold Chain Mission
Ewan McGregor examining vaccines inside a Walk In Fridge that is designed to maintain temperatures as low as -20 degrees centigrade.
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