[The battle against leprosy in Spain in the first half of the XX century].

The present work deals with the measures taken in Spain during the first half of the XX century to fight leprosy. The main policy to curb this infectious and contagious disease consisted first in isolating the patients; nevertheless, as knowledge concerning the disease grew up considerably, its preventive measures started to evolve along the period. Another point of decisive influence regarding the fight against leprosy was the intervention of the health authorities in the different historical moments and the social response to this evil.