Kenya

"We are hearing of countries administering their third doses. If they do that we're not sure there'll even be a first dose for some at risk in Africa."

World record holder Agnes Tirop has been described as Kenya's 'jewel' and 'one of the fastest-rising athletics giants on the international stage'.

A criminal investigation is now underway into the death of the Kenyan athlete, with police saying her husband was a suspect after going missing.