The reason why people with long Covid can suffer from “brain fog” has been discovered by Irish scientists.

The breakthrough has profound importance for the understanding of brain fog and cognitive decline seen in some patients with the condition, according researchers at Trinity College Dublin.

It brings the possibility of new treatments for the condition, but also for other neurodegenerative illnesses such as multiple sclerosis (MS), they said.

The research, published in Nature Neuroscience on Thursday, shows disruption to the integrity of blood vessels in the brains of patients suffering from long Covid and brain fog.