For example, a flu strain is a certain biological form of the influenza or flu virus.

H7N9 is a bird flu strain of the species Influenza virus A (avian influenza virus or bird flu virus).

The H1N1 form of swine flu is one of the descendants of the strain that caused the 1918 flu pandemic.

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

Many references to bird flu and H5N1 in the popular media refer to this strain.

This year's swine flu strain grew very poorly in early production basically .6 doses per egg.

We need rapid diagnostics so that we can tell if somebody has a strain of flu which we have only identified very recently.

A bird adapted strain of H5N1, called HPAI A(H5N1) for highly pathogenic avian influenza virus of type A of subtype H5N1, is the highly pathogenic causative agent of H5N1 flu, commonly known as avian influenza ( bird flu ).

Strain

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

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

Bird flu.

Make a strain.

HlV makes flu

like swine flu.

Why the flu?

Something of a strain.

Swine Flu for Grownups

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

Take your time. Don't strain.

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.

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

Who Pays for Bird Flu?

Special event on Avian flu

As variable as flu is,

So this, swine flu pink.

Everybody's down with the flu.

Strain in the German German relationship.

Not while I'm under this strain.

Now don't strain yourself, Will Mossop.

I was vaccinated against the flu.

SB I think flu is different.

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.

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.

Be careful, it's heavy. Don't strain anything.

I used it to strain the spaghetti.

The nurse gave Tom a flu shot.

Luckily, this year's flu was relatively mild.

Well, you could develop flu like symptoms.

And now comes the Spanish flu also.

I bet I'm getting the Asiatic flu.

This relationship, however, is not always without strain.

It's imperative to take the strain off himself.

Now you can strain him through a sieve.