Loss of pyrethroid resistance in newly established laboratory colonies of Aedes aegypti.

Background: Resistance to pyrethroid insecticides in Aedes aegypti has become widespread after almost two decades of the frequent use of these pesticides to reduce arbovirus transmission. Despite this resistance, pyrethroids continue to be used because they are relatively inexpensive and have low human toxicity. Resistance management has been proposed as a way to retain the use of pyrethroids in natural populations.

Report of Chikungunya Virus in Wild Populations of in Guerrero State, Mexico.

We detected vertical transmission of chikungunya virus (CHIKV) in wild populations of from San Marcos, Guerrero, Mexico, with real-time reverse transcriptase-polymerase chain reaction. A total of 20 pools (1-11 specimens/pool) of larvae, male, and female mosquitoes were tested. We report the detection of CHIKV in 2 of 11 larval pools, 4 of 5 male pools, and 1 of 4 female pools, from field-collected mosquitoes.

A distinctive new species of Genus Neorhegmoclemina Cook (Diptera: Scatopsidae) from Mexico.

A new Neotropical species, Neorhegmoclemina yolotli sp. nov., is described and illustrated based on adult specimens collected in the state of Guerrero, Mexico.

First record of the genus Abrhexosa Freeman from Mexico, with the description a new species, and two new species and new records of the genus Swammerdamella Enderlein (Diptera: Scatopsidae).

The genus Abrhexosa Freeman is reported for the first time from Mexico, with the description of a new species, A. patriciae sp. nov.

[Susceptibility and insecticide resistance mechanisms in Anopheles albimanus from the southern Yucatan Peninsula, Mexico].

Objective: To diagnose susceptibility levels and insecticide resistance mechanisms in Anopheles albimanus from the southern Yucatan Peninsula (YP), Mexico.

Material And Methods: F1 generation of An. albimanus females, collected from November to December 2005 in six villages in the Othon P.