New Predictive Model Helps Identify Those at Risk for Severe COVID-19

A new predictive model can help identify those at risk for severe COVID-19, aiding in the fight against the global pandemic.

Researchers at the Buck Institute (Novato, CA, USA) analyzed data from the COVID-19 Symptom Tracker app used by three million people in the UK, adding the use of immunosuppressant medication, use of a mobility aid, shortness of breath, fever, and fatigue to the list of symptoms and comorbidities that increase the risk for severe COVID-19. Out of the three million people who used the app, about 11,000 people tested positive for the virus and about 500 ended up in the hospital.


The symptom-tracking app collects data from multiple angles, asking people to describe how they feel, symptoms they are experiencing, and medications they are using along with demographics and lifestyle factors such as nutrition and diet. The results did not identify chronological age as a risk factor for severe COVID-19 and the fact that elderly people are less likely to use a smartphone app was a limitation of the study. However, many of the factors identified in the study are related to aging. Additionally, the findings identified the use of immunosuppressant medications as a major predictor of more serious disease warrant more investigation.

“Are these patients doing worse because of an underlying auto-immune/auto-inflammatory disease or because the medications are suppressing their inflammatory response – we don’t know,” said Buck Institute Associate Professor David Furman, PhD, the senior scientist who led the study. “Labs around the world are studying the overactive immune response that leads to the cytokine storm which is associated with severe COVID-19. Our findings highlight the need to understand the biology of what is at play in these cases.”

Furman and colleagues are using artificial intelligence and machine learning to pursue other COVID-related research. Efforts are underway to predict patients likely to become COVID “long haulers” – those who experience ongoing debilitating symptoms long after they recover from acute disease. Researchers are also correlating earlier data that identified aging phenotypes within individual proteomes (the entire complement of proteins expressed within our cells and tissues) with the proteomes of those infected with the coronavirus. Furman says preliminary data suggests that there is a subgroup of COVID-19 patients who are aging faster in regards to their proteome. He says the hope is to identify interventions that would restore their protein expression to a younger state.

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