Health officials are searching for dozens of airline passengers who may have come in contact with a San Francisco woman infected with a multidrug-resistant form of tuberculosis returning home from a stay in India.

A 30-year-old woman from Sunnyvale, Calif., returned to San Francisco in mid-December carrying a multidrug-resistant form of tuberculosis. In late December, state and federal health officials announced her case, saying she had checked into a hospital on Dec. 19 and would remain in isolation until her disease is no longer infectious. She is currently in stable condition.

The woman, whom authorities have declined to identify, arrived in San Francisco on Dec. 13 aboard an American Airlines flight that she boarded in New Delhi. The flight stopped in Chicago before continuing to San Francisco International, reports the Associated Press.

She is being treated at Stanford Hospital. Officials said the chances that she had infected anyone else were minimal.

“She did have symptoms on the flight,” said Santa Clara County Health Director Dr. Marty Fenstersheib. “She was coughing.”

Health officials said she had been diagnosed with TB in India, where she received treatment. She was still being treated when she returned to the Bay Area. Last week, Fenstersheib noted that the woman felt too sick once home to go out Christmas shopping so there was no contact with crowds.

She came into the emergency room at Stanford Hospital on Dec. 19, with advanced symptoms of TB.

Health authorities said the people present in the emergency room that day have already been notified, as has been the woman’s family.

Another 44 persons identified to have possibly had contact with the woman on the international flight are to be contacted by health authorities in 17 states at the request of the Centers for Disease Control and Prevention Centers.

These 44 persons sat within two rows of the woman and are being urged to get checked for tuberculosis. The risk of infection is far lower than passing on influenza or the common cold, doctors said, according to the AP.

Staying in the presence of someone infected with TB for more than eight hours is considered prolonged exposure entailing risk of contamination.

Health authorities said multidrug-resistant TB is not more infectious but it is more difficult to treat because it resists the most common antibiotics.

The woman will remain in the isolation unit for at least another two weeks.