Can one have a tuberculous infection more than once?

Yes. Unlike some other infections, such as measles and mumps, a TB infection does not necessarily give immunity to further TB infections. A child with a healed primary infection can months or years later have another, new, primary infection. Therefore, pulmonary tuberculosis may be due to immediate spread from the original primary infection, reactivation of an old primary infection which had not healed, or spread from a further primary infection.

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