Bacilloscopy for leprosy in Brazil's public health system between 2013 and 2022

Abstract

Objective: To evaluate the annual number of skin smear microscopies for leprosy performed in the Unified Health System (SUS) in the last decade. Methods: An ecological, longitudinal, retrospective, and quantitative study was conducted using data from the Ambulatory Information System (SIA/SUS). The number of skin smear microscopies for leprosy per 100,000 residents was estimated for Brazil and its five macroregions, between 2013 and 2022, with a significance level (a) of 5%. Results: More than 1.3 million skin smear microscopies were reported in the last decade in the SUS. The median annual incidence was 67 skin smear microscopies for leprosy per 100,000 residents, with the maximum observed in 2013 (82) and the minimum in 2022 (46). Annual incidences in the North, Central-West, and Northeast macro-regions were significantly higher than the national estimate, whereas in the South and Southeast, they were lower (p <0.05). The temporal trend was considered decreasing for the national estimate (p = 0.002), with an annual percentage variation of -5.6% (95%CI = -3.8%; -8.2%). However, after disregarding the years of the COVID-19 pandemic (2020-2022), the trend became stationary (p = 0.181). Furthermore, the incidence during the pre-pandemic period was significantly higher compared with the third year after the advent of the pandemic in all macro-regions of Brazil (p <0.05). Conclusion: It was possible to conclude that the SUS performed a significant number of skin smear microscopies for leprosy in the last ten years, but there are macro-regional disparities in Brazil and a significant impact of the COVID-19 pandemic.

Keywords

• Leprosy
• Mycobacterium leprae
• Unified Health System
• Diagnostic Techniques and Procedures
• Epidemiology