title: Reactive arthritis due to infestation with Giardia lamblia.
mesh_terms: D000293:Adolescent; D001170:Arthritis, Infectious / Q000469:parasitology*; D005260:Female; D005872:Giardia / Q000472:pathogenicity; D005873:Giardiasis / Q000175:diagnosis*; D006801:Humans; D013585:Synovitis / Q000469:parasitology