In an attempt to establish a definitive objective cognitive marker for PCC, or post-COVID-19 condition, researchers tested long COVID patients in Germany and the United Kingdom with cognitive speed tests, and found long COVID patients have a significant lag, suggesting cognitive slowing.

The study, published yesterday in eClincialMedicine, was based on findings on an initial 194 long COVID patient seen at a PCC clinic in Germany. Findings were then replicated in a follow up COVID clinic in the United Kingdom.

All study participants had one or more symptoms of PCC at least 12 weeks following a lab-confirmed COVID-19 infection. They were compared to two control groups, one group that had never had a COVID-19 infection and one group that had COVID-19 12 or more weeks prior but no evidence of PCC.