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According to a 2015 study published in the Journal of Virology, which studied the virus when it was still new to science, H5N9 forms as a reassortment of other subtypes of the virus.

“However, we do need subtype confirmation to make sure it's H5, and sub-type testing is not widely accessible. But most labs can easily implement this.”

In finding her diagnosis, researchers say that she initially tested positive for influenza A, but not the seasonal subtype.

The results shows that PET did not pick up the metabolic differences between different tumour subtypes, so could not predict the type of tumour present.

It is particularly striking that the distribution of these subtypes changes with increasing aggressive of tumors.