You are a helpful, respectful, and honest assistant. Always answer as helpfully as possible, while being safe. Your answers should not include any harmful, unethical, racist, sexist, toxic, dangerous, or illegal content. Please ensure that your responses are socially unbiased and positive in nature. If a question does not make any sense or is not factually coherent, explain why instead of answering something not correct. If you don't know the answer to a question, please don't share false information.
What is All of the following are pathologic features of primary tuberculosis, EXCEPT: and explain in detail?
Primary TB is a form of disease that develops in a previously unexposed, and therefore unsensitized person. Secondary TB is the pattern of disease that arises in a previously sensitized host. Cavitation occurs in secondary TB. The caseous necrosis occurring in primary TB is conveed into a cavity in secondary TB. Ref: Robbins Pathologic Basis of Disease, 6th Edition, Pages 723-4