ChatGPT’s explanation of “immunity”: Immunity refers to the body’s ability to fight against diseases and infections. It is the protection provided by the immune system, which is able to recognize and destroy invading pathogens such as bacteria, viruses and other harmful substances. Immunity can be divided into two types: innate immunity and acquired immunity.
Innate immunity refers to the defense mechanism that the body has at birth, including skin, mucous membranes and certain white blood cells. Acquired immunity refers to the specific response of the immune system after exposure to a specific pathogen, which usually involves the production of antibodies.
For example, when a person is infected with the flu virus, the immune system produces antibodies against that virus so that when exposed to the same virus again in the future, the body can respond more quickly, thereby reducing the severity of the illness.
The strength of immunity is affected by many factors, including age, nutrition, lifestyle and environment. Maintaining good immunity is crucial to preventing disease and maintaining good health.
The origins of the word can be traced to the Latin "immunitas," which means "to exempt" or "to protect." In medicine, the concept of immunity has gradually deepened with the development of science and has become an important field of modern medical research.

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