In pontaic fever, which antigen is seen in urine?: (A) Lipopolysaccharide-1, (B) Lipopolysaccharide-2, (C) Lipopolysaccharide-4, (D) Lipopolysaccharide-6
Answer is A. Ans. is 'a' i.e., Lipopolysaccharide-1 Legionella are classified into serogroup on the basis ofgroup specific lipopolysaccharide (somatic antigen or 'O' antigen). Legionella pneumophila sero-group-1 (LP-1) is the most common infecting organism. Urine test detect LP-1.