Bird flu refers to an illness caused to a particular host caused be any of species of influenza virus. This bird flu is also called as Avian Influenza in which birds are affected by a particular influenza A virus. It is usually spread from bird to bird. Bird flu is technically caused by H5N1 and H7N9 bird flu viruses. This influenza virus attacks the birds and when humans consume them, they will be affected by this virus, where humans do not have any immunity against the virus and so causes severe effects.
Prevention: There is no treatment for bird flu and the virus is most effective to humans and so prevention can only be done by taking certain precautionary measures like will preferring birds as a source of food better to check them whether they are affected by any virus or not.
For the past seven years a serious bird flu (avian flu) has been making its way around the world through the wild and domestic bird flocks. This new bird flu virus known as H5N1 is extremely virulent and causes illness and death to birds infected.When a human comes in contact with a bird that is infected with H5N1 and the human contracts the virus there is an over 50% chance of death for the individual. As of February 27, 2007 the World Health Organization (WHO) has reported 275 cases and 167 people have died.The concern is that the avian flu will move to human populations and cause great sickness and death. For the past 1000 year a pandemic has occurred every 10-50 years. In the last century there were three pandemics.