BACKGROUND: Lyme borreliosis is not usually diagnosed in Spanish patie
nts since before 1987. The aim of this study was to know the clinical
spectrum of infection by Borrelia burgdorferi in Spain by a prospectiv
e epidemiologic study. METHODS: The period of collection of cases was
from 1987 to 1989 and the follow-up period was of 2 years following di
agnosis. Detection of serum antibodies was performed by indirect immun
ofluorescence and ELISA to patients with clinical suspicion of Lyme bo
rreliosis established in 17 Spanish hospitals. The clinical and serolo
gic data and the possibility of other disease which could justify the
symptoms were evaluated with the doctor responsible for the patient. R
ESULTS: Fifty-four patients with clinical manifestations and serologic
data indicative of the disease and in whom other diagnosis were exclu
ded were detected. Other diseases which could be the cause of the symp
tomatology were diagnosed in 26 patients with positive serology. Sixty
-three percent of the patients had neurologic symptoms, 46 % articular
symptoms, 44 % cutaneous symptoms and 9 % cardiac symptoms. CONCLUSIO
NS: Lyme borreliosis is not excepcional in Spain. Its clinical spectru
m may be situated half way between American and European epidemiologic
descriptions. Serology must be interpreted by the clinical manifestat
ions.