Vectorial competence of Aedes aegypti (Linnaeus 1762) Rio de Janeiro Strain, to Dirofilaria immitis (Leidy 1856)

Serrão, Maria Lúcia; Labarthe, Norma; Lourenço‐de‐Oliveira, Ricardo

doi:10.1590/s0074-02762001000500001

Cited by 30 publications

(32 citation statements)

References 27 publications

(36 reference statements)

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…infections may lead to a species-specific increase of mosquito mortality [46, 47], e.g. through invasion of the Malphigian tubule cells [48]. In order to make a definitive assessment of the vector competence of the different mosquito species, some studies in Europe analyzed mosquito heads and abdomens separately to differentiate between infective (potential to transmit the nematode) and infected specimens (only microfilaria in its stomach), but generally did not find significant differences regarding the classification as a vector or non-vector for Dirofilaria spp.…”

Section: Discussionmentioning

confidence: 99%

Circulation of Dirofilaria repens and Dirofilaria immitis in Moldova

et al. 2016

View full text Add to dashboard Cite

BackgroundOver the last two decades, a significant spread of dirofilariasis has been observed in eastern and central Europe. However, data on the circulation of Dirofilaria spp. in Moldova were absent although direct neighbor states reported high incidence rates of human dirofilariasis.MethodsDaily mean temperature data were used to calculate Dirofilaria spp. development units, which were used to estimate the potential for complete extrinsic development in the mosquitoes (= sum of potential Dirofilaria spp. transmission days). In addition, 4,481 adult female mosquitoes were collected from 25 trapping sites. From 2010 to 2015, sampling was conducted with Centers for Disease Control miniature light traps, indoor resting mosquito collections as well as human landing catches in urban, rural and natural areas. Mosquitoes were analyzed for the presence of D. repens and D. immitis DNA using a duplex real-time PCR assay targeting nucleotide differences within the cytochrome c oxidase subunit 1 (D. repens) and 16S rRNA gene fragment (D. immitis).ResultsThe average of the yearly sum of potential Dirofilaria spp. transmission days between 2010 and 2015 ranged from 90 to 140 days with an increasing gradient from the North to the South of Moldova. Positive mosquito pools for D. repens were found countrywide at 13 of the 25 trapping sites and in 17 of the 22 screened mosquito taxa (26.51% of all 347 tested pools), while D. immitis was detected only at 4 of the trapping sites (Center and South) in 4 different mosquito species (8.65% of all 347 tested pools). Highest infection rates (EIR) per 100 specimens for both Dirofilaria species were found in An. maculipennis (s.l.) (D. repens: EIR = 4.91; D. immitis: EIR = 2.01), whereas the most frequent mosquito taxon Cx. pipiens (s.l.)/torrentium had significantly lower infections rates (D. repens: EIR = 0.88; D. immitis: EIR = 0.47).ConclusionsThe temperature conditions in Moldova are suitable for transmission of Dirofilaria spp. within the entire country, which is supported by a wide distribution of Dirofilaria spp.-positive mosquitoes with high infection rates. The low number of reported human cases most likely does not reflect the current epidemiological situation of dirofilariasis in Moldova.Electronic supplementary materialThe online version of this article (doi:10.1186/s13071-016-1916-4) contains supplementary material, which is available to authorized users.

show abstract

Section: Discussionmentioning

confidence: 99%

Circulation of Dirofilaria repens and Dirofilaria immitis in Moldova

et al. 2016

View full text Add to dashboard Cite

show abstract

“…Not all larvae ingested by the mosquitoes will survive inside the gastrointestinal tract and some of the larvae are expelled by the vector itself, whereas others are injured by the oropharyngeal tract during the repast 22 . As a result, the transmission is reduced 22 .…”

Section: Discussionmentioning

confidence: 99%

Survey of Bancroftian filariasis infection in humans and Culex mosquitoes in the western Brazilian Amazon region: implications for transmission and control

Korte

Fontes

Camargo

et al. 2013

Rev. Soc. Bras. Med. Trop.

View full text Add to dashboard Cite

Revista da Sociedade Brasileira de Medicina Tropical 46(2):214-220, Mar-Apr, 2013http://dx.doi. org/10.1590/0037-8682-1708-2013 Major Article INTRODUCTION Survey of Bancroftian filariasis infection in humans and ABSTRACT Introduction:The aim of this work was to identify possible lymphatic filariasis foci in the western Brazilian Amazonian that could be established from the reports of Rachou in the 1950s. The study was conducted in three cities of the western Brazilian Amazon region -Porto Velho and Guajará-Mirim (State of Rondônia) and Humaitá (State of Amazonas). Methods: For human infection evaluation thick blood smear stained with Giemsa was used to analyze samples collected from 10pm to 1am. Polymerase chain reaction (PCR) was used to examine mosquito vectors for the presence of Wuchereria bancrofti DNA. Humans were randomly sampled from night schools students and from inhabitants in neighborhoods lacking sanitation. Mosquitoes were collected from residences only. Results: A total 2,709 night students enrolled in the Program for Education of Young Adults (EJA), and 935 people registered in the residences near the schools were examined, being 641 from Porto Velho, 214 from Guajará-Mirim and 80 from Humaitá. No individual examined was positive for the presence of microfilariae in the blood stream. A total of 7,860 female Culex quinquefasciatus specimens examined were negative by PCR. Conclusions: This survey including human and mosquito examinations indicates that the western Amazon region of Brazil is not a focus of Bancroftian filariasis infection or transmission. Therefore, there is no need to be included in the Brazilian lymphatic filariasis control program.

show abstract

“…Apesar da densidade dos vetores influenciar na probabilidade de transmissão, não se pode afirmar que, quando em baixa densidade, aquela espécie não promova a transmissão (LUDLAM et al, 1970;PARKER, 1993). A espécie mais frequentemente capturada, A. aegypti, pode ter sido o vetor da infecção felina na região do Grande Meier, uma vez que já foi apontada como vetor natural em outros países (VEZZANI et al, 2006) e como potencial vetor no Estado do Rio de Janeiro em estudo experimental (SERRÃO et al, 2001). Portanto, qualquer uma das três espécies capturadas em maior frequência pode ter realizado a transmissão, principalmente, porque mosquitos das três espécies já foram capturados no Estado do Rio de Janeiro, contendo sangue canino e felino (GOMES, 2007).…”

Section: Discussionunclassified