Transmission of endemic St Louis encephalitis virus strains by local Culex quinquefasciatus populations in Cordoba, Argentina

Díaz, Luis Adrián; Flores, Fernando S.; Beranek, Mauricio; Rivarola, María Elisa; Almirón, Walter Ricardo; Contigiani, Marta Silvia

doi:10.1093/trstmh/trt023

Cited by 32 publications

(20 citation statements)

References 12 publications

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“…In temperate areas, arbovirus transmission is highly influenced by mosquito vector abundance [20,21]. In urban sites of central Argentina, SLEV is mainly transmitted by Culex quinquefasciatus [22] and potentially also by Culex interfor [5]. These mosquitoes’ populations have two annual peaks: a small one in late spring-early summer (November-December) and a large one in late summer-early fall (February-March) [18,19].…”

Section: Discussionmentioning

confidence: 99%

Activity Patterns of St. Louis Encephalitis and West Nile Viruses in Free Ranging Birds during a Human Encephalitis Outbreak in Argentina

et al. 2016

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St. Louis encephalitis virus (SLEV) (Flavivirus) is a reemerging arbovirus in the southern cone of South America. In 2005, an outbreak of SLEV in central Argentina resulted in 47 human cases with 9 deaths. In Argentina, the ecology of SLEV is poorly understood. Because certain birds are the primary amplifiers in North America, we hypothesized that birds amplify SLEV in Argentina as well. We compared avian SLEV seroprevalence in a variety of ecosystems in and around Córdoba city from 2004 (before the epidemic) and 2005 (during the epidemic). We also explored spatial patterns to better understand the local ecology of SLEV transmission. Because West Nile virus (WNV) was also detected in Argentina in 2005, all analyses were also conducted for WNV. A total of 980 birds were sampled for detection of SLEV and WNV neutralizing antibodies. SLEV seroprevalence in birds increased 11-fold from 2004 to 2005. Our study demonstrated that a high proportion (99.3%) of local birds were susceptible to SLEV infection immediately prior to the 2005 outbreak, indicating that the vertebrate host population was primed to amplify SLEV. SLEV was found distributed in a variety of environments throughout the city of Córdoba. However, the force of viral transmission varied among sites. Fine scale differences in populations of vectors and vertebrate hosts would explain this variation. In summary, we showed that in 2005, both SLEV and to a lesser extent WNV circulated in the avian population. Eared Dove, Picui Ground-Dove and Great Kiskadee are strong candidates to amplify SLEV because of their exposure to the pathogen at the population level, and their widespread abundance. For the same reasons, Rufous Hornero may be an important maintenance host for WNV in central Argentina. Competence studies and vector feeding studies are needed to confirm these relationships.

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Section: Discussionmentioning

confidence: 99%

Activity Patterns of St. Louis Encephalitis and West Nile Viruses in Free Ranging Birds during a Human Encephalitis Outbreak in Argentina

et al. 2016

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“…Cx. quinquefasciatus Say, 1823, is an important vector for St. Louis encephalitis virus (SLEV) and West Nile virus (WNV) . In Mexico and the United States, this species is one of the major vectors for WNV, but often it is unclear which vertebrate hosts are involved in the transmission cycles and what is leading to an epidemic outbreak .…”

Section: Introductionmentioning

confidence: 99%

Mammalophilic feeding behaviour of Culex quinquefasciatus mosquitoes collected in the cities of Chetumal and Cancun, Yucatán Peninsula, Mexico

Janssen

Fernández‐Salas²,

Díaz-González³

et al. 2015

Tropical Med Int Health

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“…There is active transmission of filariasis in the state of Pernambuco, Brazil [5,6]. This species can also transmit several arboviruses such as West Nile Virus and Saint Louis encephalitis [7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Population genetics of neotropical Culex quinquefasciatus (Diptera: Culicidae )

Wilke

Vidal

Suesdek

et al. 2014

Parasites & Vectors

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Multilocus cluster Bayesian analysis confirmed that populations are mutually distinct, and the set of results point to genetic differences among populations. The presumable low gene flow among them may be due to the large geographic distances (>1000 km) and to the environmental heterogeneity of the sampled areas. The genetic structure observed in this study may lead to the best understanding of Cx. quinquefasciatus demographical diversity as well as their genetic variations patterns in Brazil so far unknown.

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Transmission of endemic St Louis encephalitis virus strains by local Culex quinquefasciatus populations in Cordoba, Argentina

Abstract: Our findings suggest that Cx. quinquefasciatus populations are susceptible to and able to transmit different SLEV strains.

Cited by 32 publications

References 12 publications

Activity Patterns of St. Louis Encephalitis and West Nile Viruses in Free Ranging Birds during a Human Encephalitis Outbreak in Argentina

Activity Patterns of St. Louis Encephalitis and West Nile Viruses in Free Ranging Birds during a Human Encephalitis Outbreak in Argentina

Mammalophilic feeding behaviour of Culex quinquefasciatus mosquitoes collected in the cities of Chetumal and Cancun, Yucatán Peninsula, Mexico

Population genetics of neotropical Culex quinquefasciatus (Diptera: Culicidae )

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