This Phase II project is for the advancement of diagnostic capabilities for detecting Group A Streptococcus pharyngitis (GAS). The goals under the contract include a comprehensive and diverse database, multiple trained and optimized deep learning models deployable on a mobile device, FDA clearance for the algorithms, and the validation of the app's performance through clinical research. These achievements will establish the foundation for a reliable, accurate, and user-friendly diagnostic tool that can effectively detect GAS pharyngitis in children.