San Francisco ? Health officials were searching Monday for dozens of airline passengers who may have come in contact with a 30-year-old woman infected with a hard-to-treat form of tuberculosis on a flight from India.

The 30-year-old woman, whom authorities declined to identify, was being treated at a Bay Area hospital. Officials said the chances that she had infected anyone else were minimal.

The woman 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.

Health officials said she was diagnosed with TB in India, but boarded the flight anyway. Such passengers are typically barred from boarding flights originating in the United States, but U.S. officials have little authority over who boards incoming international flights.