Group A Streptococcus (Strep A) causes a wide spectrum of diseases, ranging from pharyngitis and impetigo to severe invasive infections and immune-mediated conditions such as acute rheumatic fever, rheumatic heart disease and acute post-streptococcal glomerulonephritis. Contemporary data on the global burden of Strep A diseases are lacking. The proposed study aims to use administrative data from numerous jurisdictions to estimate age-specific incidence or prevalence of Strep A diseases, with an emphasis on severe clinical endpoints. Depending on the availability of data, a secondary objective will be to estimate the economic burden of Strep A diseases.

This population-based descriptive study will use routine health data obtained from different low-income and middle-income and high-income countries through international research collaborations to estimate the country-level and global burden of Strep A diseases. Data will be primarily obtained and collated from hospital or national health laboratory databases for individuals across all age groups, along with emergency department, primary care and microbiological datasets where available. Strep A disease endpoints will be identified using International Classification of Diseases 10th Revision or other relevant coding systems and microbiological diagnosis. Age-specific incidence and prevalence rates will be computed using population denominators, and country-level age-adjusted rates will be applied to standard global reference populations to estimate the number of cases globally.

Ethical approval to conduct this study was obtained from the Human Research Ethics Committee at the University of Western Australia (reference: #2024/ET000401) and governance approval was obtained from The Kids Research Institute Australia. The findings from this study will be published in peer-reviewed journals and presented at Strep A Vaccine Global Consortium collaborative meetings.

To determine age-specific and age-standardised incidence trends of acute rheumatic fever (ARF) or rheumatic heart disease (RHD) among Indigenous Western Australians aged less than 35 years of age.

A population-based retrospective cohort study with linked data analysis.

Western Australian hospital admissions (1996–2022) and RHD notifications to the state-based register (2011–2015).

Patients, both Indigenous and non-Indigenous aged

Of 1746 incident ARF/RHD cases, 1526 (87%) were Indigenous peoples, with the highest rates observed in patients aged 5–14 years, with an annual estimated increase of 4.3% (95% CI 3.2% to 5.2%). The 0–4 years age group experienced an annual increase in incidence rates of 4.8% (95% CI 1.4% to 8.2%). Overall, Indigenous patients experienced an annual increase of 1.9% (95% CI 1.3% to 2.6%) from 1996 to 2022. However, most cases (n=894) were identified after multiple significant policy developments (2011–2022) with an annual increase of 5.7% (95% CI 3.7% to 7.5%) for this period.

Increasing trends of incident ARF/RHD were observed in Indigenous patients aged under 15 years, with the greatest annual increments observed after policy implementation for disease reporting and awareness in the period from 2011 to 2022. Improvement in case ascertainment of ARF/RHD may be contributing towards increasing trends with improved reporting and monitoring of incident cases in very young Indigenous Australians more recently.