So that's why every year you can catch a slightly different strain of flu.

We tried it against flu A viruses H1N1, H3N2 as well as flu B viruses.

That's the sound of genetic mutations of the avian flu becoming a deadly human flu.

Think of cancer, of bird flu, swine flu, SARS.

Just look at pandemics swine flu, bird flu, H1N1.

I've got a touch of the flu.

Catch a signal.

Bird flu.

But there is a catch. Of course there is always a catch in these cases.

Catch as catch can.

As variable as flu is, HIV makes flu look like the Rock of Gibraltar.

So let's take a look at the flu virus.

Swine Flu for Grownups

I caught the flu.

And the Avian Flu is also not a good idea.

And that most people who die of regular flu which in regular flu years is about 360,000 people worldwide, most of them senior citizens and they die not of the flu but because the flu gives an assault to their immune system.

Throw a sprat to catch a whale.

But it has a terrible catch, and the catch is that this system is destined to collapse.

Where can I catch a bus?

It's easy to catch a cold.

So this, swine flu pink.

Who Pays for Bird Flu?

Special event on Avian flu

Pandemic bird flu early detection, early response. It is a litany.

The swine flu virus, at the moment, is a symmetrical object.

No longer must flu have to kill half a million people a year.

We set a trap to catch a fox.

They don't catch them in a net.

Can I catch a taxi near here?

Take care not to catch a cold.

A wooden building can easily catch fire.

Be careful not to catch a cold.

We really could think of flu, then, as just a bad cold.

I was vaccinated against the flu.

So a nice example of this came from last year and swine flu.

When swine flu first appeared, the initial news caused a lot of overreaction.

Luckily, this year's flu was relatively mild.

Well, you could develop flu like symptoms.

And now comes the Spanish flu also.

Here, catch!

It is difficult to catch a rabbit by hand.

SB I think flu is different. I think what happened with flu is we've got a bunch I just showed some of this a bunch of really cool and useful technologies that are ready to go now.

Seth Berkley HIV and flu the vaccine strategy

So today, we get our flu vaccines from ...

Laurie Garrett on lessons from the 1918 flu