X-rays, first used clinically in the late 1890s, could be a leading-edge diagnostic tool for COVID-19 patients with the help of artificial intelligence, according to a team of researchers in Brazil. They used machine learning methods to teach a computer program to detect COVID-19 in chest X-rays with 95.6 to 98.5% accuracy. They published their results in IEEE/CAA Journal of Automatica Sinica.