I'm Lisa Douset from the BBC World Service. I've been reporting from Afghanistan for more than 30 years.

The Americans are now out, the Taliban in. How did we get here? What happens next? Our podcast, A Wish for Afghanistan, may be able to help.

Search for A Wish for Afghanistan wherever you get your podcasts.

Hello, I'm Ros Atkins. Each week on the BBC World Service, I look in detail at one of the biggest stories in the news.

This week is the ethics of COVID booster jabs.

Not many people get a round of applause when they get their COVID jab, but

91 year old Margaret Keenan from the UK did. She was one of the first in the world

to get the Pfizer vaccine back in December of last year.

Since then, more than 5.7 billion Jabs have been administered,

and who gets them as been potent and political from the start?

Well, now the UK Prime Minister Boris Johnson plans to use booster jabs

to stop a winter wave of COVID.

We're going to be building even higher walls of immunisation of vaccine protection in this country.

This is in line with other rich countries, including Israel and France who are already doing it. The US has

plans too and their scientific justification for using boosters is clear.

This is Health Secretary Sajid Javid from the UK's government.

There's evidence that the protection offered by COVID-19 vaccine reduces overtime,

particularly older people who are greater risk.

And so booster doses are an important way of keeping

the virus under control for the long term. That's the objective, but the degree to which

immunity decreases is not clear.

This is a precautionary tactic, and it means some will get a third jab, while others in the

...