H5N1 is an avian influenza virus subtype.

The H5N1 flu is what is commonly meant when talking of "bird flu" or "avian influenza".

It is a viral disease that causes illness in many species including humans and is a pandemic threat.

Due to the high lethality and virulence of HPAI A(H5N1), its endemic presence, its increasingly large host reservoir, and its significant ongoing mutations, the H5N1 virus is the world's largest current pandemic threat, and billions of dollars are being spent researching H5N1 and preparing for a potential influenza pandemic.

At least 12 companies and 17 governments are developing pre-pandemic influenza vaccines in 28 different clinical trials that, if successful, could turn a deadly pandemic infection into a nondeadly one.

Full-scale production of a vaccine that could prevent any illness at all from the strain would require at least three months after the virus's emergence to begin, but it is hoped that vaccine production could increase until one billion doses were produced by one year after the initial identification of the virus..

For more information about the topic H5N1, read the full article at Wikipedia.org, or see the following related articles:

Flu vaccine — The flu vaccine is a vaccine to protect against the highly variable influenza virus. The annually updated trivalent flu vaccine for the 2005-2006 ...  > read more

Avian flu — Avian flu (also "bird flu", "avian influenza", "bird influenza"), means "flu from viruses adapted to birds", but is sometimes mistakenly used to ...  > read more

Pandemic — A pandemic is an epidemic (an outbreak of an infectious disease) that spreads worldwide, or at least across a large region. There have been a number ...  > read more

Influenza pandemic — An influenza pandemic is a large scale epidemic of the influenza virus, such as the 1918 Spanish flu. The World Health Organization (WHO) warns that ...  > read more

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