There stories were recorded for a 2012 BBC doumentary, Ewan McGregor: Cold Chain Mission, about UNICEF's immunisation work.
Find out more about Ewan's journey on our interactive map.
Three-year-old Deborah lives with her mum and sisters in the village of Losso in north-eatern Congo.
It's already a remote location and difficult for health workers to reach. But during the fishing season the family travels even further into the tropical forest to fish.
Deborah's mum, Katie, understands all too well why vaccinations are important.
Not long ago Deborah caught measles. She became very sick and had to be taken to hospital. It took almost three days to get there, paddling in a dug-out canoe. The little girl had a terrible fever and her body was limp; Katie feared she would die.
She'd never been more scared. But the experience showed her why she needed to get her children vaccinated.
Give a child a life-saving vaccine.
This year, Deborah had her routine vaccinations back in the village, thanks to the local UNICEF-supported mobile vaccination and healthcare team.
Although the mobile team aren't able to visit very often, Katie has learnt a lot from Ibrahim, the mobile vaccinator, about protecting her children.
"I would like my daughter to become a midwife when she grows up", she says. "I want her to be able to help women in need one day."
Learn more about UNICEF's immunisation work.