Uma nova ameaça à nossa porta: consequências da dispersão do vírus da dengue num mundo em constante mudança
Resumo
Dos arbovírus transmitidos por mosquitos, o vírus da dengue (DENV) é aquele que maior impacto exerce sobre a saúde humana. Ainda que a sua dispersão esteja, em parte, dependente das condições ambientais que determinam a dispersão do seu principal vetor (Aedes aegypti), a sua distribuição pelo planeta tem sido imparável. Embora essencialmente circunscrito a ambientes tropicais e subtropicais, este vírus afeta cerca de 1/3 da população mundial. A inexistência de uma vacina eficaz ou de terapêutica especificamente dirigida contra este vírus tornam o controlo dos seus principais vetores a principal arma de que dispomos para limitar a sua circulação. No entanto, a maioria das infeções são inaparentes e a maior parte das manifestações clínicas são indistintas, sendo genericamente englobadas na categoria das síndromes febris. Assim, a presença deste vírus nem sempre é fácil de detetar. Adicionalmente, o estabelecimento de populações vetoriais em ambientes urbanos abre oportunidade à aproximação entre vírus e humanos, e ao estabelecimento de epidemias em locais, a priori, pouco prováveis para que tal acontecesse. O surto de dengue na Madeira em 2012-2013 foi disso exemplo. Mais do que o impacto na saúde e economia locais, esta situação veio revelar o quão difícil é o controlo de circulação de arvobírus patogénicos, numa Europa parcialmente colonizada por outro dos seus principais vetores (Ae. albopictus) se poderá revelar.
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