A nursing student has been given a tuberculin test prior to doing his clinical practicum at a nursing home. After about 36 hours, he notices a hard red swelling at the test site. Which of the following is NOT a possible conclusion from this result?
He should not be allowed to work at the nursing home, because he has an active case of tuberculosis. :
While it is possible he may have an active case, this test alone cannot verify this conclusion. Additional diagnostics should be performed to determine whether he has an active case.