Raw cheese made with milk from dairy cattle infected with bird flu can harbor infectious virus for months and may be a risk to public health, according to a new study from researchers at Cornell University that was funded by the US Food and Drug Administration.

Scientists already discovered that raw milk can harbor the infectious H5N1 bird flu virus, but now there’s a new study on its capabilities that has health officials concerned.

Researchers from the University of Pennsylvania, USA, have found that previous exposure to certain seasonal influenza viruses can enhance cross-reactive immunity against the H5N1 avian influenza virus.