99.08.12 - Study finds allergy shots help years after they are halted. Study finds allergy shots help years after they are halted. Symptoms of hay fever allergy are reduced for years after monthly immunization injections have ended. Researchers who noted this pattern recommended beginning allergy shots as soon as symptoms appear in order to reduce allergy severity.
Study finds allergy shots help years after they are halted.
New England Journal of Medicine on the web.