Transmission of tuberculosis to hospital workers by a patient with AIDS
J R Pierce1, S L Sims, G H Holman
1Amarillo BiCity-County Health Unit, Regional Academic Health Center, Amarillo.
Abstract:
A patient with acquired immunodeficiency syndrome (AIDS) was admitted to a hospital with cough and fever and after 29 days was transferred to a hospice. He was eventually shown to have active pulmonary tuberculosis. This diagnosis was obscured clinically by simultaneous infection with Pneumocystis carinii and Mycobacterium avium complex (MAC). Laboratory recognition of Mycobacterium tuberculosis was delayed because of overgrowth of cultures by MAC but was later established using DNA probe techniques. Thirty (19 percent) of 158 health care workers who had been exposed to this patient had conversion of their tuberculin skin tests. Diagnostic difficulties and nosocomial transmission of tuberculosis may occur when patients with AIDS have mixed mycobacterial infections.
Insights
Diagnosing tuberculosis in AIDS patients is challenging due to co-infections like Pneumocystis and MAC. Delayed lab results and staff infections highlight risks of mixed mycobacterial infections in immunocompromised individuals.
Area of Science:
- Infectious Diseases
- Immunology
- Microbiology
Background:
- Patients with Acquired Immunodeficiency Syndrome (AIDS) are susceptible to opportunistic infections.
- Tuberculosis (TB) and non-tuberculous mycobacterial (NTM) infections are significant concerns in AIDS patients.
- Mixed mycobacterial infections can complicate diagnosis and treatment.
Observation:
- A patient with AIDS presented with cough and fever, later diagnosed with active pulmonary tuberculosis.
- The diagnosis was initially obscured by co-infections with Pneumocystis carinii and Mycobacterium avium complex (MAC).
- Overgrowth of MAC in cultures delayed the laboratory identification of Mycobacterium tuberculosis.
Findings:
- DNA probe techniques were crucial for confirming Mycobacterium tuberculosis.
- 19% of exposed healthcare workers showed tuberculin skin test conversion, indicating nosocomial transmission.
- Mixed mycobacterial infections pose diagnostic challenges in AIDS patients.
Implications:
- This case underscores the need for advanced diagnostic methods in immunocompromised patients with suspected mycobacterial infections.
- Awareness of potential mixed infections is critical for timely diagnosis and preventing disease spread.
- Healthcare facilities must implement stringent infection control measures to mitigate nosocomial transmission of tuberculosis.
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