Please read this article on Bird Flu (mainly in US), which is an easy to read article - compared to some articles on this! So far as I know there have been v. few cases in wild birds in UK so far, & I haven't heard of any flocks of chickens being affected here.
https://www.cancerhealth.com/article/know-us-bird-flu-outbreak-chronic-disease-risk
https://www.cancerhealth.com/article/know-us-bird-flu-outbreak-chronic-disease-risk
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https://www.bbc.co.uk/news/articles/c391mpmr81xo
https://www.nfuonline.com/updates-and-information/nfu-ai-case-finder/