Experimental Argentine hemorrhagic fever: myocardial involvement in Cebus monkey.

Four Cebus apella monkeys, to test a recently proposed model for testing neurovirulence of Junín virus (JV) strains, were intracerebrally infected with 10(5) LD50 of the XJ clone 3 strain of JV. There were no significant electrocardiographic abnormalities or gross lesions, but all infected monkeys exhibited a varying degree of histologic myocardial lesions including focal lymphoblastic infiltrates, vascular ruptures, and mild interstitial reactive change. One Cebus showed lymphocytic infiltrates in the caudal portion of the A-V node without specific cell involvement. These preliminary results demonstrate cardiac involvement in experimental infection of the Cebus monkey with Junín virus.

Aging jejunal vascular ectasia as a cause of persistent intestinal bleeding.

Undiagnosed gastrointestinal bleeding is a major problem in medical practice. This paper describes a patient with vascular intestinal ectasia who had repeated severe intestinal hemorrhages for two years, and required surgery. Vascular intestinal ectasia was demonstrated radiologically, histologically and by electron microscopy in a 25 cm upper jejunum resection. The absence of ultrastructural alterations in intestinal vessels points out that the term "aging vascular ectasia" (Moore Type I) seems preferable, when Rendu Ossler, Von Willebrand and intestinal hemangioma are discarded.