This study, conducted by Dr. Andrés Moreira-Soto, Dr. Jan Felix Drexler (Charité – Universitätsmedizin Berlin) and colleagues, examined how economic and social factors influence the number of COVID-19 tests performed (testing capacity) in 109 countries between 2020 and 2021. They found that socioeconomic and gender inequalities play a critical role in shaping testing capacity, highlighting the need for equitable access to healthcare and targeted public health interventions.