Less contagious than COVID-19, from the Wikipedia article:

Humans - Avian flu viruses, both HPAI and LPAI, can infect humans who are in close, unprotected contact with infected poultry. Incidents of cross-species transmission are rare, with symptoms ranging in severity from no symptoms or mild illness, to severe disease that resulted in death.[43][42] As of February, 2024 there have been very few instances of human-to-human transmission, and each outbreak has been limited to a few people.[44] All subtypes of avian Influenza A have potential to cross the species barrier, with H5N1 and H7N9 considered the biggest threats.[45][46]