Tuberculin skin test conversion from exposure to contaminated pulmonary function testing apparatus

Area of Science:

• Infectious Diseases
• Epidemiology
• Public Health

Background:

• Tuberculosis (TB) is a significant global infectious disease, primarily spread person-to-person via droplet nuclei.
• Healthcare settings can be vulnerable to outbreaks if infection control measures are not rigorously maintained.

Purpose of the Study:

• To investigate an outbreak of tuberculosis infection within a hospital environment.
• To identify the source and transmission routes of the TB outbreak.
• To emphasize key factors in infectious disease transmission.

Main Methods:

• Documented tuberculin test conversions from negative to positive in hospital employees and patients.
• Epidemiological investigation focusing on exposure to a smear-positive pulmonary tuberculosis case.
• Analysis of potential transmission vectors, including shared medical equipment.

Main Results:

• Eight individuals (7 employees, 1 patient) showed positive tuberculin test conversions over 10 weeks.
• Seven employees were identified as close contacts of a newly diagnosed active pulmonary TB case.
• A single patient's infection was linked to contaminated pulmonary function testing apparatus.

Conclusions:

• The hospital outbreak underscores the importance of stringent infection control protocols for tuberculosis.
• Transmission was attributed to both direct contact and potentially contaminated medical equipment.
• Understanding inoculum, reservoir, and host factors is crucial for preventing TB spread.