Investigation of the Frequency of Positive PPD Test in Candidate Patients Receiving Immunosuppressive Drugs Hospitalized in Shahid Sadoughi Hospital in Years 2019-2020

Introduction: Tuberculosis is one of the most common infections that lead to death,; incidence of tuberculosis is higher in individuals with immune system deficiency. Candidates for receiving immunosuppressive drugs should be examined for the presence of latent tuberculosis, so that if this test is positive, appropriate treatment and prophylaxis measures for tuberculosis can be carried out for them. The purpose of this study was to screen patients who are candidates for receiving immunosuppressive drugs in terms of tuberculosis. Methods: This cross-sectional study was conducted on the patients who were candidates for injectable immunosuppressive drugs hospitalized in Shahid Sadoughi Hospital between 2019 to 2020. Tuberculin skin test (TST) was taken from all eligible patients by the infection control unit of the hospital. Statistical analysis was done by SPSS V16. The P value less than 0.05 was considered statistically significant. Results: Participants were divided into three groups: healthy (TST=0-4), suspected (TST=5-9) and infected with tuberculosis (TST≥10); the frequency in the three groups was 83 (23.9%), 164 respectively. (47.3%) and 100 (28.8%). There was a significant relationship between the reason for referral to receive immunosuppressive drugs and the results of the TST test (P=0.003). Conclusion: If the patients with rheumatology, dermatology disorders and kidney transplant candidates receive immunosuppressive drugs, they are at high risk of primary tuberculosis infection and activation of latent tuberculosis, and it is necessary for health workers to pay more attention to this issue