A longer or slower than expected, or desired, amount of time between onset of symptoms
and initiation of therapy.
https://www.cochrane.org/fr/CD015443/MS_quels-sont-les-benefices-et-les-risques-des-differents-traitements-susceptibles-de-retarder-ou-de 2024 United Kingdom review of literature french abstract multiple sclerosis multiple sclerosis, nos Treatment Delay risk assessment multiple sclerosis risks and benefits