Millions of people in Congo and Angola being vaccinated against yellow fever. One of the largest mass vaccination programs ever attempted after more than 300 deaths since December. The World Health Organization hopes to protect 14 million people in the next ten days. 8 and a half million people in the capital Kinshasa alone.
> A series of outbreaks of Yellow Fever earlier this year have left a global shortage, so the program is using what's called a fractional vaccine, giving just one year immunity rather than the normal ten, while children under two are expected to be given the full dose.
It takes a year to manufacture, using chickens' embryos. This laboratory in France, one of just four worldwide. The virus is spread by mosquitoes that thrive in water. The WHO warning it wants people to be ready when the rainy season hits next month.