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2. Which of the following statements describe primary infection?
Select all that apply.

  • a) It occurs on first exposure to M. tuberculosis

  • b) M. tuberculosis lodges in the terminal alveoli of the lungs

  • c) The immune response develops about 4–6 weeks after the primary infection.

  • d) It results in a pathological lesion that is characteristically localized, often with extensive tissue destruction and cavitation

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