Transcript for More Than 350 Newborns May Have Been Exposed to TB
York. In the bay area, tonight, new developments in the search for more than 350 newborns that may have been exposed to tuberculosis. What we're learning about the nurse and the risk to the babies, the mothers,nd hundreds of other adults. Here's aditi Roy. Reporter: Tonight, a major medical scare in San Jose, California. Officials at the Santa Clara valley medical center are racing to contact over 1,000 people may have been exposed to tuberculosis after a maternity ward nurse tested positive for the deadly disease. The hospital has identified 350 newborns, 368 mothers and 308 workers who may have had contact with the nurse between mid-august to mid-november. The hospital posting this letter to its website, "While the risk of infection is low, the consequences of a tuberculosis infection in infants can be severe." Hospital officials recommend that the babies protectively take an antibiotic for the next six months to nine months even if they test negative. The judgment is, it's safer to treat than not to treat. Reporter: Hospital officials say the nurse's annual T.B. Test was negative but she was diagnosed with T.B. In November during treatment for an unrelated illness. Since she showed no symptoms, they say the risk of exposure is extremely low. Nearly 10,000 people in the U.S. Develop tuberculosis every year. Here in California, health officials say T.B. Rates are twice as high as the nation's average because the state receives so many global travelers. Tom? Aditi, thank you.
This transcript has been automatically generated and may not be 100% accurate.