[Serologic prevalence of human leptospirosis in 2 different groups in the province of Formosa, Argentina].

Sera from two different human group from the Province of Formosa were checked for 14 leptospira serovars, using Martin & Petti's microagglutination test with live antigens. In the first group, consisting of 605 males from the whole province, sampled during premilitary medical screening, 20 were found positive (3.3%). The predominant serovars were as follows: L. bratislava (50%), L. pomona (25%), L. butembo and L. icterohemorragica (20%), L. canicola (15%) and last L. wolffii (5%). In the second group, the sera were obtained from the local Central Hospital, and were taken from adults of both sexes, from a limited area of the province. With regard to Group I, there was a high number of positive (32.3%) and a variation in the frequency of serovars, the results being as follows: L. butembo (38.8%), L. pomona (33.3%), L. bratislava (31.4%), L. icterohemorragica (12.9%), L. borincana (3.7%) and finally L. canicola, L. pyrogenes, L. wolffii and L. bataviae (1.8%).