Earlier quoted context omitted.
I vaguely remember reading more about this elsewhere and I believe they only used COVID positive patients. It would be interesting if there are follow-up studies with mixed training data if true.
No the researchers tested using both positive and negative patients.
“Across around 2,500 captured cough recordings of people confirmed to have COVID-19, the AI correctly identified 97.1 percent of them – and 100 percent of the asymptomatic cases.”
https://www.sciencealert.com/ai-cough-analysis-could-detect-...