Abstract
LTTB is a common condition occurring in one fourth of those who were exposed to mycobacterial bacilli
with Medically induced immunosuppression stands as a significant risk factor for having LTTB. Aim of
the study: To assess the prevalence and characteristics of LTTB in patients on immunosuppressive
agents and biological treatment. A cross-sectional research of 150 patients on immunosuppressants
and biological therapy for diverse diseases at Baghdad teaching hospital outpatient rheumatology,
dermatology, and TB clinics between 2023 and 2024 was done. All patients were examined with a
detailed clinical history, physical exam, and chest x-ray or CT scan. IGRA testing was done per
manufacturer instructions and evaluated as positive, negative, or indeterminate. The study involved 149
patients with autoimmune diseases, using immunosuppressants like methotrexate and azathioprine.
Significant differences in sex distribution, smoking status, infliximab usage, and disease duration were
observed between IGRA-positive and IGRA-negative patients. While univariable analysis showed
several factors influencing IGRA test positivity, only disease duration was significant in multivariable
analysis. The prevalence of latent tuberculosis in the cohort was 34.9%. In conclusion, High prevalence
of latent Tuberculosis (34.9%) was found in patients who were treated with immunosuppressive agents
and biological therapies, of them Smoker, male, and infliximab-treated patients were significantly
susceptible to LTTB.
with Medically induced immunosuppression stands as a significant risk factor for having LTTB. Aim of
the study: To assess the prevalence and characteristics of LTTB in patients on immunosuppressive
agents and biological treatment. A cross-sectional research of 150 patients on immunosuppressants
and biological therapy for diverse diseases at Baghdad teaching hospital outpatient rheumatology,
dermatology, and TB clinics between 2023 and 2024 was done. All patients were examined with a
detailed clinical history, physical exam, and chest x-ray or CT scan. IGRA testing was done per
manufacturer instructions and evaluated as positive, negative, or indeterminate. The study involved 149
patients with autoimmune diseases, using immunosuppressants like methotrexate and azathioprine.
Significant differences in sex distribution, smoking status, infliximab usage, and disease duration were
observed between IGRA-positive and IGRA-negative patients. While univariable analysis showed
several factors influencing IGRA test positivity, only disease duration was significant in multivariable
analysis. The prevalence of latent tuberculosis in the cohort was 34.9%. In conclusion, High prevalence
of latent Tuberculosis (34.9%) was found in patients who were treated with immunosuppressive agents
and biological therapies, of them Smoker, male, and infliximab-treated patients were significantly
susceptible to LTTB.
Keywords
Biological therapy
Immunosuppression
Infliximab
Latent Tuberculosis