Three are thought to have picked up the infection after a night of clubbing in the Midlands city.
DNA investigation showed that all six cases were linked, and had been spread either by person-to-person, or by a common source.
Dodgy MilkThe source of the outbreak is believed to be a man who drank untreated, unpasteurised milk.
Professor Peter Hawkey, from the Regional Centre for Mycobacteriology at Birmingham Heartlands Hospital which made the discovery, said most cases of TB are usually found in people in their 60s and 70s but said people using pubs and clubs in the Birmingham area should not be concerned.
"The risk is tiny," he said. "But the health message is that anyone who experiences persistent weight loss with night sweats, tiredness and a cough should seek medical attention as it is just possible they might have TB."
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