BOSTON (AP) – Three people who had contact at Boston medical facilities with a worker infected with tuberculosis have shown signs of exposure, but none are contagious or have symptoms, city health officials said Thursday.

More than 2,600 patients and staff have been tested at the Boston Medical Center and the Veterans Administration hospitals in West Roxbury and Jamaica Plain since the surgical resident was diagnosed with an active form of tuberculosis last month.

None of the three people who tested positive have shown signs or symptoms of TB, according to the Boston Public Health Commission. A spokeswoman said the three include patients and staff.

The resident was contagious for six months while she rotated through BMC, the VA hospitals, Cape Cod Hospital and Brockton Hospital.

The resident apparently had contact with nearly 4,300 patients and workers at the five hospitals between last December and early June.

Last week, Cape Cod Hospital said six patients showed signs of exposure but none were contagious.

Symptoms include cough, high fever, chills and fatigue, according to public health officials.

Tuberculosis only can be spread by people who have symptoms of the illness.

Boston testing will continue, officials said.