[Dengue fever in three sanitary districts in the city of Belo Horizonte, Brazil: a population-based seroepidemiological survey, 2006 to 2007].

Objective: To determine the seroprevalence of dengue fever serotypes in three sanitary districts in the city of Belo Horizonte and investigate the association of seroprevalence with contextual and individual variables.

Method: The survey was conducted in the sanitary districts of Venda Nova, Leste and Centro-Oeste between June 2006 and March 2007. All residents aged 1 year or older were eligible for the study.

Antimicrobial, antiviral and cytotoxic activity of extracts and constituents from Polygonum spectabile Mart.

Polygonum spectabile is used in Brazil for treatment of several infection diseases. Extracts and constituents isolated from this species were evaluated for cytotoxicity and effects on 15 bacterias and yeasts as well on 4 viruses strains (HHV-1, VACV-WR, EMCV, DEN-2). Less polar extracts were effective against Staphylococcus aureus, Bacillus subtillis, Micrococcus luteus, M.