
A study, aimed at identifying the risk factors for the severity of COVID-19 in patients with multiple sclerosis in France, was carried out by teams from the neurology department of the Pitié-Salpêtrière hospital AP -HP, from the Brain Institute (Inserm / CNRS / Sorbonne University) at the Pitié-Salpêtrière hospital AP-HP, from Sorbonne University and the neurology service of the Strasbourg CHU.