[Parvovirus B19 arthritis: Report of three cases].

Parvovirus B19 infection is highly prevalent in children and the most common manifestation is a facial rash. In adults, acute polyarthritis and skin rash are often the presenting features. We report three patients with the disease.

[Study of celiac disease in patients with non-alcoholic fatty liver and autoimmune hepatic diseases].

Unlabelled: Celiac disease (CD) has been associated with non-alcoholic fatty liver disease (NAFLD) and other chronic liver diseases (CLD), such as primary biliary cirrhosis (PBC), autoimmune hepatitis (AIH) and primary sclerosing cholangitis (PSC).

Aim: To study the frequency of serological markers of CD in patients with NAFLD and CLD and their correlation with duodenal biopsy.

Patients And Methods: In patients with NAFLD, PBC, AIH and PSC, we studied anti-endomysium (AE) IgA by indirect immunofluorescence and anti-gliadin IgA-IgG (AG) and human anti-tissue transglutaminase (tTG) IgA antibodies by an ELISA technique.

[Lyme disease in Chile. Prevalence study in selected groups].

Background: The prevalence of Lyme disease in Chile is unknown.

Aim: To study the existence and epidemiology of Lyme disease in Chile.

Patients And Methods: One hundred eighteen patients with signs or symptoms suggestive of Lyme disease were studied.

Two sisters producing anti-U1RNP exhibit serological concordance and clinical discordance.

Two sisters had autoimmune responses to the U1RNP particle that were quantitatively similar and/or identical in molecular characteristics. No other autoantibodies were demonstrable. Both sisters immunoprecipitated only U1RNA, had a reaction of identity in gel diffusion, bound the 68-kDa band in HeLa cell extract in Western blot, and reacted almost equally to a rabbit anti-idiotypic reagent made against either sister's isolated anti-U1RNP Fab fragments.