During a routine quality and safety audit, the infection prevention department identifies that a patient with a chronic cough and night sweats was housed in a standard semi-private room for four days before being correctly diagnosed with active pulmonary tuberculosis. The patient, initially admitted for failure to thrive and suspected bacterial bronchitis, was not placed on any transmission-based precautions during this period. The facility must now initiate an exposure investigation and management protocol.
Arrange the following steps in the most appropriate chronological sequence according to standard infection control and public health guidelines.
- 1Relocate the index patient immediately to an Airborne Infection Isolation Room (AIIR).
- 2Establish the exact dates of the patient's infectious period to delineate the timeframe of the exposure.
- 3Identify and stratify all healthcare personnel, patients, and visitors who shared airspace with the index patient during the infectious period.
- 4Perform baseline tuberculosis screening (e.g., IGRA or TST) on all identified unprotected contacts.
- 5Administer a second tuberculosis screening test 8 to 10 weeks post-exposure for contacts whose baseline test was negative.
Cevap
The correct sequence is: Relocate the index patient, establish the infectious period, identify and stratify contacts, perform baseline screening, and administer a second screening 8 to 10 weeks later.
The management of an unprotected tuberculosis exposure in a healthcare facility follows a strict chronological protocol prioritizing immediate patient safety, followed by systematic epidemiological investigation. First, ongoing transmission must be stopped by isolating the source patient in a negative-pressure AIIR. Second, the infection control team must define the period of infectivity (e.g., 3 months prior to symptom onset or positive smear) to establish the temporal boundaries of the exposure. Third, using this timeframe, a line list of all exposed contacts (staff, patients, visitors) who shared the airspace without adequate PPE is compiled. Fourth, these contacts undergo baseline IGRA or TST testing; a positive result at this stage indicates pre-existing latent TB infection, as there has not been enough time to mount an immune response to the current exposure. Finally, contacts who test negative at baseline must be re-tested 8 to 10 weeks after their last known exposure to account for the immunological window period necessary for T-cell sensitization to manifest.
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Anahtar Kavram
Management of a healthcare-associated tuberculosis exposure requires immediate source isolation, epidemiological timeframe definition, contact identification, baseline immunological screening, and delayed testing at 8-10 weeks to account for the seroconversion window.