In rural areas, the H5N1 virus is easily spread from farm to farm among domestic poultry through the feces of wild birds. The virus can survive for up to four days at 71 F (22 C) and more than 30 days at 32 F (0 C). If frozen, it can survive indefinitely.
So far in this outbreak, human cases have been blamed on direct contact with infected chickens and their droppings. People who catch the virus from birds can pass it on to other humans, although the disease is generally milder in those who caught it from an infected person rather than from birds.
Like bird flu, the other infections too can spread from one person to another. The disorders or the infectious disease are caused by the organisms. These include virus, bacteria, parasites and fungi. There are a number of organisms that reside in the human body. These are mostly harmless and some of them are also useful. But in certain conditions some of the organisms may end up causing disease in humans.
If the virus mutates and combines with a human influenza virus, it could be spread through person-to-person transmission in the same way the ordinary human flu virus is spread.