[en] The increasing spread of Aedes (Stegomyia) albopictus (Skuse, 1894)—commonly known as the Asian tiger mosquito and potential vector of various arboviruses —along the Spanish Mediterranean coast and the intense traffic between this area and the Community of Madrid had increased the risk of its arrival in the latter region. Thus, in 2016 the Community of Madrid's Health Department set up a program for the entomological surveillance and environmental health control of vectors that transmit arboviruses (dengue, chikungunya and zika).The aim of this paper is to analyze the information obtained in the course of this program from 2016 till 2020. Entomological surveillance was designed along the big axes formed by the radial highways that link Madrid with the Mediterranean coast. This active surveillance consisted in installing lethal ovitraps and looking for larvae hatcheries. This was complemented with passive, citizen-based surveillance via channels such as Mosquito Alert. In the summer of 2017, eggs resembling those of Ae. albopictus were found in a trap installed at a gas station on the N-III Highway. In 2018, two persons respectively submitted photos of adult mosquitoes they had seen in two municipalities of the Community of Madrid—Velilla de San Antonio and Rivas- Vaciamadrid, which were later confirmed to belong to this species by the Entomology Laboratory of the Complutense University of Madrid's Biological Sciences Faculty. Subsequent entomological surveillance in these two municipalities showed that the Asian tiger mosquito had already settled in the former but not in latter. However, a second reintroduction apparently occurred in 2020, the presence of this species being confirmed in Rivas-Vaciamadrid.

[pt] A crescente implantação de Aedes (Stegomyia) albopictus (Skuse, 1894), vetor potencial de vários arbovírus e comummente conhecido como mosquito tigre, no litoral mediterrâneo, e o grande tráfego existente entre estes lugares e a Comunidade de Madrid, aumentou o risco da sua chegada à região. Por essa razão, a Comunidade de Madrid estabeleceu, no ano de 2016, o Programa de Vigilância Entomológica e Controlo Sanitário-Ambiental de Vetores Transmissores de Arbovírus (dengue, chikungunya e zika). O objetivo desde artigo é analisar a informação obtida desde o início no ano de 2016 até ao ano de 2020. A vigilância entomológica foi desenhada em torno dos eixos principais das estradas radiais que ligam Madrid ao Mediterrâneo. Esta vigilância ativa realiza- se mediante a colocação de armadilhas de oviposição, de adultos e a prospeção de criadouros de larvas. É complementada com dispositivos como o Mosquito Alert. No verão de 2017 detetou-se a presença de ovos compatíveis com Ae. albopictus numa armadilha localizada num posto de combustível na Nacional III. No ano de 2018, dois cidadãos enviaram fotografias de mosquitos adultos encontrados em dois municípios da Comunidade de Madrid, Velilla de San Antonio y Rivas-Vaciamadrid, que foram confirmados em laboratório de entomologia da Faculdade de Ciências Biológicas da Universidade Complutense de Madrid, como Ae. albopictus. A monitorização entomológica subsequente nesses dois municípios reflete o estabelecimento do mosquito tigre no primeiro município, o que não foi confirmado em Rivas em 2018, mas sim em 2020, quando uma segunda reintrodução aparentemente ocorreu.