A third case of tuberculosis has been found in the Madison student population.
The Northeast school district says the third student TB case was discovered this month.
Last month two other students contracted tuberculosis.
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That led to testing 325 other students and staff who'd come in contact with those two victims.
Metro Health officials believe the student contracted the disease from a parent suffering from TB, and is not related to the previous two cases.
"It's not easy to catch. Usually a person has to be in close contact with the infected person for a prolonged period of time in order to catch that illness," said NEISD spokesperson Vic Garcia.
The district says it will send letters Friday to the 180 students and 5 staff members who had contact with the latest TB victim.
Those letters will contain further instructions on what steps they should take.
The district says all three students with TB have been isolated and are not on Madison's campus.