A case investigation of a patient with extensively drug-resistant tuberculosis (XDR-TB), X District, Songkhla Province, Thailand, 2019
Keywords:
extensive drug-resistant tuberculosis, XDR-TB, Songkhla, case investigationAbstract
Background: On October 9, 2019, the situation awareness team of the office of Disease Prevention and Control region 12 (ODPC12) received notification of a confirmed extensive drug-resistant tuberculosis (XDR-TB) case from the 12th Regional Tuberculosis Center. The investigation team of ODPC12, 12th Regional Tuberculosis Center, and Songkhla provincial public health office jointly investigated on 10–11 October 2019. We aimed to identify the source of the infection and risk factors for XDR-TB, find close contacts and give recommendations for prevention and control.
Methods: Descriptive studies were done by reviewing medical records, chest x-ray, laboratory data, and drug susceptibility testing (DST) at the hospital. We interviewed the case to identify the source of infection and find close contacts. Laboratory studies were done, including CXR, sputum for Acid-Fast Bacillus, and DST. The environmental health study surveyed hospitals, housing, and communities of a confirmed case.
Results: The patient is a Thai man, 49 years old, a construction worker, who was first diagnosed with tuberculosis on August 11, 2012, as a polydrug-resistant strain. The suspected source of infection might come from a migrant worker who worked closely together in 2011. Inappropriate treatment is a significant factor in becoming XDR-TB at last. We met three household contacts, and two were close contacts. Laboratory results showed one of the household contacts had a TB infection without drug resistance. We found the confirmed case lived alone in a high-TB prevalence slum. The turbulence of air circulation inside the TB clinic is a risk of TB transmission in the hospital.
Conclusion: The confirmed case was initially polydrug-resistant, and he might have gotten the infection from a migrant worker. He was becoming XDR-TB due to improper treatment. We met one TB-infected household contact. He stays alone in a well-ventilated home. Inside TB clinics, facing bad air circulation. The healthcare team should regularly review the treatment of TB cases and improve the hospital environment to prevent TB transmission. Disease prevention teams should work with the multidisciplinary section to improve TB surveillance in high-risk communities.
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