San Diego County TB Program Announces Possible Exposure on Trolley’s Blue Line

San Diego County TB Program Announces Possible Exposure on Trolley’s Blue Line

A doctor examines the X-rays of a tuberculosis patient. (Spencer Platt/Getty Images)

City News Service

City News Service

5/29/2024

Updated: 5/29/2024

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SAN DIEGO — The county’s Tuberculosis Program is working with the Metropolitan Transit System to notify riders of the trolley’s Blue Line that they were potentially exposed to and are at risk for tuberculosis.
The exposure happened between Jan. 27 and Feb. 29 of this year, and the specific impacted routes are:
  • The Blue Line between 24th Street Transit Center and Barrio Logan Transit Center, on Monday to Friday, on an inconsistent schedule but typically between 10:30 a.m. and 2:30 p.m. in the above time frame; and
  • The Blue line between San Ysidro Transit Center and Old Town Transit Center roughly between 5 and 7 a.m., and from Old Town to San Ysidro between 6 and 7 p.m. on Friday, Feb. 16.
Since exposures occurred at inconsistent hours, the likelihood that any rider had long cumulative exposure times is low, according to the county. These exposures are not known to be associated with any previously reported exposures on the MTS system.
TB is an airborne disease that is transmitted  through inhalation of the bacteria from the air. People with frequent and prolonged indoor exposure to a person who has TB should get tested.
“Symptoms of active TB include persistent cough, fever, night sweats and unexplained weight loss,” Dr. Wilma Wooten, county public health officer, said in a statement.
“Most people who become infected after exposure to tuberculosis do not get sick right away. This is called latent TB infection. Some who become infected with tuberculosis will become ill in the future, sometimes even years later if their latent TB infection is not treated. Blood tests and skin tests are effective in determining whether someone has been infected.”
Taking medicines for latent TB infection can cure the infection and keep people from ever getting active TB disease.
According to the county, the chance of TB infection is highest for people with many hours of cumulative indoor exposure to a person who is sick with TB. Brief interactions with an ill rider are less likely to lead to TB infection than are prolonged or repeated exposures.
The county’s TB Control Program recorded 193 cases in 2020, 201 in 2021 and 208 in 2022. In 2023, the county recorded 243 people with active TB.
An estimated 175,000 people in San Diego County have a latent TB infection and are at risk for developing active TB without preventive treatment, health officials said. People who test positive for TB, but who do not have symptoms of active TB, should get a chest X-ray and talk to a medical provider, as they may have a latent TB infection.
Anyone who would like more information on this potential exposure should call the county TB Control Program at 619-692-5565.
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