Scientists have discovered a new influenza virus in pigs, dubbed G4, that has the potential to be transmitted between humans.

The virus contains a blend of genetic material, Science reports, from several strains including the H1N1 strain from the 2009 pandemic that killed 12,000 Americans.

Humans have no immunity for the new virus, though it does not appear to have jumped to many humans yet, according to findings detailed in a new study published in the journal Proceedings of the National Academy of Sciences today.

“From the data presented, it appears that this is a swine influenza virus that is poised to emerge in humans,” Edward Holmes, an evolutionary biologist at the University of Sydney who was not involved in the research, told Science. “Clearly this situation needs to be monitored very closely.”

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