Guide to Measure the Prevalence of Active TB Disease Among Health Care Workers

The World Health Organization (WHO) estimates that approximately 1.5 million health care workers are infected with TB each year. This guide aims to provide a comprehensive framework for measuring the prevalence of active TB disease among health care workers. The rationale for conducting prevalence surveys among health care workers is to identify the scope of the problem, assess the effectiveness of existing control measures, and inform policy and programmatic decisions. Indications for conducting prevalence surveys include high TB incidence rates, inadequate TB control measures, and limited access to diagnostic services. The scope of this guide is to provide a standardized approach for conducting prevalence surveys among health care workers. The objectives of this guide are to provide a framework for designing and implementing prevalence surveys among health care workers, to identify the inclusion and exclusion criteria for participants, and to outline the proposed case definitions and screening strategies. The guide also aims to provide a comprehensive overview of the sampling design and methodology, data collection and analysis procedures, and quality assurance measures. Inclusion criteria for participants in prevalence surveys among health care workers include being a health care worker, having worked in a health facility for at least six months, and being willing to participate in the survey. Exclusion criteria include being a patient, having a history of TB treatment, or being unable to provide informed consent. The classification of health care workers is critical in determining the risk of TB infection. Health care workers are classified into three categories: high-risk, moderate-risk, and low-risk. High-risk health care workers include those who work in TB clinics, laboratories, and emergency departments, while moderate-risk health care workers include those who work in general medical and surgical wards. Low-risk health care workers include those who work in administrative and support roles. Proposed case definitions for TB prevalence surveys among health care workers include the use of sputum smear microscopy, chest X-ray, and culture. The guide also outlines recommended screening strategies for conducting TB prevalence surveys among health care workers, including the use of symptom-based screening and the use of rapid diagnostic tests. The sampling design and methodology for prevalence surveys among health care workers involve selecting a representative sample of health care workers from a defined population. The sample size is determined based on the desired level of precision and the expected prevalence of TB. The guide outlines the steps in determining a sample size for a representative cluster survey of TB prevalence. Data collection and analysis procedures for prevalence surveys among health care workers involve the use of standardized questionnaires, symptom-based screening, and laboratory testing. The guide outlines the procedures for preparing for data collection, collecting data, and analyzing data. Quality assurance measures for prevalence surveys among health care workers include the use of standardized protocols, training of data collectors, and quality control measures for laboratory testing. The guide outlines the procedures for ensuring the quality of diagnostic procedures, including chest X-ray and laboratory diagnostics. Data dissemination and utilization for prevalence surveys among health care workers involve the use of data to inform policy and programmatic decisions. The guide outlines the procedures for disseminating data at the individual, facility, and national levels, and for targeting the data to specific audiences.