12th January 2024

A medical student returns from her elective, where she was in close contact with a colleague who has recently started treatment for active pulmonary tuberculosis (TB).

A medical student returns from her elective, where she was in close contact with a colleague who has recently started treatment for active pulmonary tuberculosis (TB). The medical student undergoes a Mantoux test for latent TB. After 48 hours, the patient has marked induration at the site of tuberculin administration, and the result is deemed positive. Which type of hypersensitivity reaction causes the findings seen in this patient after tuberculin administration?

Select the SINGLE most appropriate option from the list below. Select ONE option only.