Cumulative mortality of Aedes aegypti larvae treated with compounds.

OBJECTIVE To evaluate the larvicidal activity of Azadirachta indica, Melaleuca alternifolia, carapa guianensis essential oils and fermented extract of Carica papaya against Aedes aegypti (Linnaeus, 1762) (Diptera: Culicidae). METHODS The larvicide test was performed in triplicate with 300 larvae for each experimental group using the third larval stage, which were exposed for 24h. The groups were: positive control with industrial larvicide (BTI) in concentrations of 0.

Experimental vaginal infection of goats with semen contaminated with the "CPG" strain of Toxoplasma gondii.

The objective was to characterize the transmission of Toxoplasma gondii in goats experimentally infected vaginally with semen contaminated with the CPG strain (genotype III). Ten female goats were randomly allocated into 2 groups (G1 and G2), each with 5 animals, and inseminated during estrus. Goats in G1 were inseminated with semen containing 1 × 10(5) tachyzoites, whereas those in G2 (control) were inseminated with semen free from tachyzoites (insemination = day 0).

Amblyomma aureolatum (Acari: Ixodidae) parasitizing margay (Leopardus wiedii) in Rio Grande do Sul.

We report the finding of Amblyomma aureolatum (Acari: Ixodidae) parasitizing margay (Leopardus wiedii) in the locality of Gravataí (29° 47' 12.9" S and 50° 53' 44.1" W; 241 m alt.