Basically the body prduces white blood cells which produce an anti-body which is the natural process of an immunity in the body.
well it all just depends on how your body is and what it can take.
Skin
Simple. They have a natural immunity or are in the right place at the right time.
They either are vaccinated against those diseases, or they have them and build a natural immunity.
the common cold and pneumonia type illnesses to which the Aztecs had no natural immunity Also smallpox.
Passive natural immunity
Natural Passive Immunity
No. No cat breed has a natural immunity against FLV (Feline Leukemia Virus), which is the reason why vaccinating kittens, no matter what the breed, against this and other diseases is so important.
For survival. Disease immunity of offspring and defense against evolving diseases. Natural occuring phenomenon that attracts a mate.
Disease came with the Europeans. The old world brought diseases to the new world and they had no natural immunity to them.
Natural immunity.
The Spanish brought diseases such as smallpox, measles, and influenza that decimated the local populations due to lack of immunity. They also introduced forced labor systems, warfare, and exploitation of resources that contributed to the destruction of early civilizations in the Americas.
European diseases killed so many Native Americans because the natives had no natural immunity. It is surmised that hundreds of thousands died.