This bacterium is only spread throughout the body when a person has an active TB infection.

A number of factors make people more susceptible to TB infections.

This is a good test for finding a TB infection.

About 15,000 people have been tested as part of this outreach program, with 30 percent over all showing a positive result, indicating possible TB infection.

If tests still show an active TB infection after 6 months, then treatment continues for another 2 or 3 months.

This will prevent health care workers and other people in the hospital from getting a TB infection.

But most TB infections are latent: no more than ten per cent will ever cause illness.

The treatment helps prevent the TB infection from becoming active, meaning it can spread to other people.

They lack the immunity to fight the TB infection and are at great risk of developing drug resistance.

"Being a frequent flier is not a significant risk factor for having TB infections," he said.