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From wikipedia. Of course the more people you are in contact with the greater the chances of transmission.
TB is spread by aerosol droplets expelled by people with the active disease of the lungs when they cough, sneeze, speak, kiss, or spit. These infectious droplets are 0.5 to 5 µm in diameter and about 40,000 can be produced by a single sneeze.[16] The disease can also spread through the sharing of the unsterilized eating utensils of the infected person; in rare cases, it can spread from a pregnant woman with active TB to her fetus.[17] The contraction of TB typically requires a more-than-casual contact with people who have the active disease. The contact should normally be either prolonged, or frequent, or intense—for example, of the kind one may have with family members or close coworkers.[18] Under such conditions the estimated infection rate is 22%
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