Infestation of an endemic arbovirus area by sympatric populations of Aedes aegypti and Aedes albopictus in Brazil

Infestation of an endemic arbovirus area by sympatric populations of Aedes aegypti and Aedes albopictus in Brazil

BACKGROUND Aedes aegypti and Aedes albopictus are the most important arbovirus vectors in the world. OBJECTIVES This study aimed to investigate and compare the infestation pattern of these species in a neighbourhood of Recife, Brazil, endemic for arboviruses in 2005 (T1) and 2013 (T2). METHODS I...

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Bibliographic Details
Main Authors: Rosângela Maria Rodrigues Barbosa, Maria Alice Varjal de Melo-Santos, José Constantino Silveira Jr, Maria Helena Neves Lobo Silva-Filha, Wayner Vieira Souza, Cláudia Maria Fontes de Oliveira, Constância Flávia Junqueira Ayres, Morgana do Nascimento Xavier, Marina Praxedes Rodrigues, Suzane Alves dos Santos, Mitsue Maia Nakazawa, Lêda Narcisa Regis
Format: Article
Language:English
Published: Fundação Oswaldo Cruz (FIOCRUZ)
Series:Memorias do Instituto Oswaldo Cruz
Subjects:
vectors
arboviruses
egg monitoring
surveillance
ovitraps
dengue
Online Access:http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0074-02762020000100320&lng=en&tlng=en
Description
Summary:BACKGROUND Aedes aegypti and Aedes albopictus are the most important arbovirus vectors in the world. OBJECTIVES This study aimed to investigate and compare the infestation pattern of these species in a neighbourhood of Recife, Brazil, endemic for arboviruses in 2005 (T1) and 2013 (T2). METHODS Infestation, distribution and relative abundance of these sympatric species were recorded by egg collection using a network of 59 sentinel ovitraps (s-ovt) at fixed sampling stations for 12 months in T1 and T2. FINDINGS A permanent occupation pattern was detected which was characterised by the presence of egg-laying females of one or both species with a high ovitrap positivity index (94.3 to 100%) throughout both years analysed. In terms of abundance, the total of eggs collected was lower (p < 0.005) in T2 (146,153) than in T1 (281,103), although ovitraps still displayed a high index of positivity. The spatial distribution showed the presence of both species in 65.1% of the 148 s-ovt assessed, while a smaller number of traps exclusively contained Ae. aegypti (22%) or Ae. albopictus (13.2%) eggs. MAIN CONCLUSIONS Our comparative analysis demonstrated the robustness of the spatial occupation and permanence of Ae. aegypti and Ae. albopictus populations in this endemic urban area.
ISSN:0074-0276
1678-8060

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