Twenty-one Grant High School students have been exposed to Tuberculosis. That's the word from the Sacramento County Public Health Department.  

Last month, it was revealed that there was a student with an active case of TB at the school. Those students were among 100 tested.

They'll have additional testing to determine whether they have latent or active TB.

So far, according to the Sacramento Bee, none of the 21 are showing symptoms.

Read More: Grant Union HS Student Diagnosed with TB