The 2009 pandemic influenza A(H1N1) virus that has been found contains genes from pig, bird and human influenza viruses, in a combination that has never been observed before anywhere in the world.
V virusu pandemske gripe A (H1N1) iz leta 2009 so odkrili gene virusov prašičje, ptičje in človeške gripe v takšni kombinaciji, kot je pred tem niso opazili še nikjer na svetu.