Smarr et al had launched TemPredict in March of 2020 to assess whether the onset of COVID-19 symptoms (i.e., fever) could be recognized using the Oura ring, a commercially available wearable device. This study looks at the findings from the first 50 subjects who had reported COVID-19 infections. The participants resided in the U.S., U.K., Finland, Australia, Germany, Honduras, Italy, The Netherlands, Norway, and Sweden. The researchers found a significant increase in maximum finger temperature during the symptom window compared to baseline. Furthermore, they also observed substantial inter-individual variance in both mean and range of finger skin temperature, emphasizing the fact that using a single temperature (i.e., 38C or 98.6F) is not appropriate. These findings counter previous concerns that distal body temperatures are too different from tympanic temperatures to be useful in detecting fevers and that it is feasible to use wearable temperature sensors to support research into other fever-associated illness. While the authors suggest that COVID-19 could be identified from wearables, but this would require data from multiple physiological variables and additional research to develop best practices.