Evidence of Legionella pneumophila infection in Chilean subjects under twenty years of ageEvidence of past exposure to i. pneumcphila was evaluated in a 1 20 chiiean subjects less than 20 yeais old stratified by socioeconomic background and age. Serum samples were analyzed for /. pneumophila antibodies by indirect immunofluorescence using serogroup 1 to 6 antigens; tilers equal or greatci than 1:64 were considered positive. Overall, 1 2 out of 1 20 samples (10%) were positive for (. pneumcphila antibodies and different prevalence rates were recorded among individuals of low [0/40], middle (2/40; 5%} and high j 10/40; 25%) socioeconomic groups. The highest liters observed in this heallhy population based survey were 1:128. High socioeconomic background is associated with highest prevalence of anfi-i. pneumophila antibodies in chilean population.(

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