There was an 'outbreak' of TB on the local reservation a few years ago, and I asked my doctor about it. She said that it isn't easily acquired, that it usually takes repeated exposure.
My memory being what it is (or isn't), I looked it up and I apparently recalled it correctly.
"...transmission of TB usually occurs only after prolonged exposure to someone with active TB. On average, people have a 50 percent chance of becoming infected with TB if they spend eight hours a day for six months or 24 hours a day for two months working or living with someone with active TB, researchers have estimated."
More info at the source:
NIAID Excerpt From the Center for Disease Control:
"To become infected, a person usually has to spend a relatively long time in a closed environment where the air was contaminated by a person with untreated tuberculosis who was coughing and who had numerous M. tuberculosis organisms (or tubercle bacilli) in secretions from the lungs or larynx. Infection is generally transmitted through the air; therefore, there is virtually no danger of its being spread by dishes, linens, and other items that are touched, or by most food products."
More info at the source:
CDC on TB Sue