Immunoperoxidase detection of Yellow Fever virus after natural and experimental infections.

Accurate diagnosis of fatal Yellow Fever (YF) is important for surveillance and prevention of epidemics in regions where the virus is endemic. Immunoperoxidase (IP) staining for viral antigens offers a means to both document infection and investigate pathogenic mechanisms. We developed an indirect IP staining assay for YF, which was used to detect YF antigen in histologic sections of human liver from patients with fatal natural infections, and suckling mouse brains experimentally inoculated with an unattenuated neurotropic strain of YF virus.

Electrophoretic study of the genome of human rotaviruses from Rio de Janeiro, São Paulo and Pará, Brazil.

Human rotaviruses from the states of Rio de Janeiro, São Paulo and Pará of Brazil were analysed by RNA electrophoresis. At least some bands characteristic of rotavirus double-stranded RNA were detected in 138 (86.8%) of 159 faecal samples in which the presence of rotavirus had been demonstrated by enzyme immunoassay.

Acute diarrhoea associated with rotavirus among children living in Belém, Brazil.

Between January 1979 and December 1980, rotaviruses were detected in faecal samples from 122 (33.1%) of 369 diarrhoeic children less than six years old, living in Belém, Brazil. In 55 (45.

An outbreak of rotavirus diarrhea among a nonimmune, isolated South American Indian community.

During July-August 1977, an outbreak of acute diarrhea occurred in an unusually isolated population, the Tiriyó Indians, who live in the north of Pará, Brazil, near the border with Surinam. Diarrhea was reported by 157 (70%) of the 224 Indians living in the village during the epidemic. There was one fatal case in a one year old child.