A huge vaccination drive has been launched after the country’s first outbreak in years of the paralysing disease. But the battle to wipe out the virus is struggling elsewhere, so how can it be eradicated?

As a seven-year-old boy is treated for polio at a hospital in Malawi, the country has launched a major vaccination campaign to stem an outbreak of the disease.

The effort in Malawi, one of the world’s poorest countries and badly hit by the aid cuts, has seen an astonishing 1.3 million children already vaccinated against the disease in just four days after emergency supplies were airlifted in by the World Health Organization (WHO) just over a week ago.