How common bacteria harmfull to human are in the meat.
For chickens the common problem is salmonella and other similar bacteria that are common in chicken farms. The meat in chicken is quite pourus and not that thick. Everythgin is quite close to the intestines where there can be bacteria. The skin it not that thick and you often just plock the feathers.
So it is common with bad bacteria for humans and high risk of it getting into the meat. That said you can eat raw chicken if enough care is take in rasing and butchering them, chicken sashimi is a raw japanese chicken dish [https://zendine.medium.com/raw-chicken-japans-lesser-known-culinary-adventure-a16044a1fc06](https://zendine.medium.com/raw-chicken-japans-lesser-known-culinary-adventure-a16044a1fc06)
If you compare it to beef there is less bad bacteria for human with cattle. The also have more compact meat, thick skin that is removed and a intestines that are easier removed. The result is there is a lot less risk of bad bacteria in beef then chicken. Bacteria that is there is primary on the surface of the meat. If you look at raw beef dishes it is common to cut away the outer layer of a thick picked of meat and use the inner part for a raw dish.
Ther are less bacteria for fish too the chickens. That is for some types of fish. Less risk if caught out at sea compared to grown in pounds in less developed part of the world. Look at [https://pubmed.ncbi.nlm.nih.gov/10826714/](https://pubmed.ncbi.nlm.nih.gov/10826714/)
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