Avian Flu virus (H5N1) was first identified in 1997, where almost all H5N1 human cases have been contracted through contact with live or dead birds.
The research has caused a storm of controversy and divided scientists, with some saying it should never have been carried out.
Scientists have developed a vaccine that could end the need for annual winter flu injections.
The Vaccine Research Center in the US say H2N2 has the ability to cause a pandemic in the same way that of H1N1.
There are 3 types (A, B and C) of the influenza virus that can cause flu. Each has subtypical strain. H1N1 is a strain of the type A virus. H1N1 is what epidemiologists call a “triple reassortment” virus because it combines genes from different flu viruses, viral strains that normally affect pigs (swine flu), along with birds (avian flu) and human flu strains.