Bird flu may be 'evolving under the radar', scientists say

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2024-09-25 14:30:07

Bird flu could be "evolving under the radar" because of failures to monitor and control the spread of the virus, a leading pandemic scientist has warned.

Dr Thomas Peacock, a specialist in animal-to-human spread of viruses at The Pirbright Institute, said H5N1 could be transmitting undetected in the US because of "months of missing data" that leaves researchers, vets and authorities in the dark.

Four workers on cattle farms have also become infected and the Centers for Disease Control (CDC) recently reported the first human case with no known contact with animals.

Dr Peacock said: "What keeps scientists up at night is the possibility of unseen chains of transmission silently spreading through farm worker barracks, swine barns, or developing countries, evolving under the radar because testing criteria are narrow, government authorities are feared, or resources are thin."

In the US there is only mandatory reporting of the disease in poultry, not mammals. The Department of Agriculture only requires testing on lactating cattle before they are moved across state borders.