Churg-Strauss syndrome: determining adequacy of corticosteroid dosage by the eosinophil count.

Prednisone therapy induced prompt clinical remission in a 38-year-old woman with hypereosinophilic vasculitis. Smoldering vasculitis accounts for the 38% fatality rate in treated patients with the Churg-Strauss syndrome. Complete suppression of the peripheral hypereosinophilia will reflect the efficacy of therapy more accurately than clinical response.