Hello, I'm Ros Atkins. Each week on the BBC World Service, I'll be looking in depth

that one of the biggest stories in the news. Today, I'm going back to the start of the

pandemic. We've all had those conversations with friends and family.

Why did this happen? How did this virus start in Wuhan? and thinking of that I've been

of that I've been listening to news reports from early last year.

A man has died following an outbreak of an unknown pneumonia-like virus.

The mystery virus started in the city of Wuhan.

Authorities say they've acted early and that the virus is contained.

The mystery virus it's called and so it was. Now though a year on we know how devastating it can be.

Remarkably we know how to make vaccines to tackle it but we still don't know how it began

and some argue we're not doing everything we can to find out.

This is the Australian Prime Minister Scott Morrison speaking last year.

It would seem entirely reasonable and sensible that the world would want to have an independent

assessment of how this all occurred so we can learn the lessons and prevent it from

happening again. His point being this wasn't happening and now almost a year

on the World Health Organization has completed its latest visit to Wuhan, led by Dr Peter and Barrack.

Did we change dramatically the picture we had beforehand, I don't think so.

Did we improve our understanding?

Did we add details to that story?

Absolutely.

In this edition, I'll look at why COVID's origin story is proving so elusive.

And first I want to concentrate on why this isn't just about science,

...