[Toxocara infections in childhood in relation to reactive arthritis].

Reactive arthritis belongs to a group of rheumatoid diseases known as seronegative spondylarthritis or spondarthropathies. Of many reactive arthritis-evoking agents, the authors focused on larval toxocarosis. The authors describe a child with high anti-Toxocara antibody and circulating antigen titres in combination with acute Chlamydia infection, which may have caused reactive arthritis in this immunologically impaired organism. This is evidence of the coincidence of different pathological factors manifested by reactive affection of the knee joint.