scholarly journals Active dispersal of Aedes albopictus: a mark-release-recapture study using self-marking units

2019 ◽  
Vol 12 (1) ◽  
Author(s):  
Laura Vavassori ◽  
Adam Saddler ◽  
Pie Müller
Keyword(s):  
Aedes Albopictus ◽  
Mosquito Species ◽  
Methodological Approach ◽  
Local Population ◽  
Local Environment ◽  
Vector Surveillance ◽  
Minimal Impact ◽  
Mark Release Recapture ◽  
Active Dispersal ◽  
And Control

Abstract Background Understanding the dispersal dynamics of invasive mosquito species is fundamental to improve vector surveillance and to target control efforts. Aedes albopictus has been deemed a poor flyer as its range of active dispersal is generally assumed to be limited to a few hundred metres, while laboratory studies suggest this mosquito could actually fly several kilometres. The discrepancy may be due to differences in the local environment or to the methodological approach. In Switzerland, Ae. albopictus has been present since 2003 and has since then expanded its range. While passive dispersal is a key driver, it remains unclear how far this mosquito spreads through active flight and what the age structure and size of the local population are, all important parameters for vector surveillance and control. Method We investigated the active dispersal, daily survival rate and population size of Ae. albopictus in mark-release-recapture studies in Coldrerio and Lugano, two areas of intensive control in Switzerland. To mark mosquitoes emerging from breeding sites, we used self-marking units with fluorescent pigment that have minimal impact on mosquito survival and behaviour. We recaptured the adult mosquitoes with BG-Sentinel traps within a radius of 1 km from the marking units over 22 consecutive days. Results We found that 77.5% of the recaptured Ae. albopictus individuals flew further than 250 m, the limit that is usually deemed sufficient for vector containment. The average age of females and males was 8.6 days and 7.8 days in Coldrerio and Lugano, respectively, while the estimated mosquito population densities were 134 mosquitoes/ha in Coldrerio and 767 mosquitoes/ha in Lugano. Conclusions Self-marking units are an effective tool to mark wild mosquitoes. Using this approach, we found that mosquitoes survive long enough to potentially transmit arboviral disease in our study area and that host-seeking Ae. albopictus females may travel further than previously assumed for European mosquito populations. This finding has direct implications for vector control as emergency treatments around positive cases, as well as surveillance and control around detections of new infestations, might need to be extended beyond the usual recommended range of just a few hundred metres.

scholarly journals From a Long-distance Threat to the Invasion Front: Invasive Aedes Mosquito Species in Belgium Between 2007 and 2020

2021 ◽  
Author(s):  
Isra Deblauwe ◽  
Katrien De Wolf ◽  
Jacobus De Witte ◽  
Anna Schneider ◽  
Ingrid Verlé ◽  
...  
Keyword(s):  
Aedes Albopictus ◽  
Mosquito Species ◽  
Aedes Mosquito ◽  
Long Distance ◽  
Invasion Front ◽  
Management Actions ◽  
Invasive Mosquito ◽  
And Control ◽  
Control Management

Abstract Background: Invasive mosquito species (IMS) and their associated mosquito-borne diseases are emerging in Europe. In Belgium, the first detection of Aedes albopictus occurred in 2000 and of Aedes japonicus in 2002. Early detection and control of these IMS at points of entry (PoE’s) are of paramount importance to slow down any possible establishment. This paper gives an account of the IMS surveillance in Belgium between 2007 and 2020 and reviews the introductions and establishments recorded in that period.Methods: In total 52 PoE’s were monitored at least once for the presence of IMS between 2007 and 2020. These included used tyre and lucky bamboo import companies, airports, ports, parking lots along highways, shelters for imported cutting plants, wholesale markets, industrial areas, recycling areas, and cemeteries and an allotment garden at the country border with colonised areas. In general, monitoring was performed between April and November. Mosquitoes were captured with adult and oviposition traps, as well as by larval sampling. A logistic regression was performed to investigate the percentage of positive PoE’s for Ae. albopictus over the years. Results: Aedes albopictus has been detected at ten PoE’s, Ae. japonicus at three PoE’s and Aedes koreicus at two PoE’s. The latter two species have established overwintering populations. The percentage of PoE’s positive for Ae. albopictus increased significantly over time. Aedes albopictus is currently entering Belgium through lucky bamboo trade, used tyre trade and passive ground transport, while Ae. japonicus only through the latter two pathways. In Belgium, the import through passive ground transport was first recorded in 2018 and its importance seems to grow.Conclusion: Belgium is currently at the invasion front of Ae. albopictus and Ae. japonicus. The surveillance and control management actions at well-known PoE‘s associated to long-distance introductions are more straightforward than at less-defined PoE’s associated with short-distance introductions from colonised areas. These latter PoE’s represent a new challenge for IMS management in Belgium in the coming years and stresses the urgence of implementing a sustainable, structured and long-term IMS management programme, integrating active and passive surveillance and control.

Expansion of the Distribution of Aedes albopictus (Diptera: Culicidae): New Records in Northern Argentina and Their Implications From an Epidemiological Perspective

2020 ◽  
Vol 57 (4) ◽  
pp. 1310-1313
Author(s):  
S Goenaga ◽  
A Chuchuy ◽  
M V Micieli ◽  
B Natalini ◽  
J Kuruc ◽  
...  
Keyword(s):  
South America ◽  
Yellow Fever ◽  
Aedes Albopictus ◽  
Nonhuman Primates ◽  
New Records ◽  
Mosquito Species ◽  
Vector Surveillance ◽  
Misiones Province ◽  
The Impact ◽  
First Time

Abstract Since the last yellow fever (YF) outbreak was detected in Argentina in 2009, vector surveillance and studies of arbovirus infections are carried out intermittently specifically in areas where nonhuman primates of the Alouatta genus are present. We report in these areas of Corrientes province the detection of Haemagogus leucocelaenus (Dyar and Shannon) (Diptera: Culicidae) and Sabethes albiprivus (Theobald) (Diptera: Culicidae), both species involved in the forest YF cycle, and also the presence of Aedes albopictus (Skuse) in new areas in Argentina, which represents the southernmost citation for this species in South America. Aedes albopictus, a mosquito species native to Asia, was reported for the first time in Argentina in 1998, in Misiones province. Since then, no other report has indicated the extension of the distribution of this mosquito. This report shows the importance of performing continual entomological and arboviruses surveillance and highlights the impact that could result from the expansion of Ae. albopictus across Argentina.

Preliminary Report of the Insecticide Susceptibility Status of Aedes Albopictus in Bangladesh

2021 ◽  
Author(s):  
Hasan Mohammad Al-Amin ◽  
Seth Irish ◽  
Audrey Lenhart ◽  
Mohammad Shafiul Alam
Keyword(s):  
Vector Control ◽  
Aedes Albopictus ◽  
Control Strategies ◽  
Mosquito Species ◽  
Routine Monitoring ◽  
Invasive Mosquito ◽  
Arboviral Diseases ◽  
And Control ◽  
Effective Drugs ◽  
Susceptibility Status

Aedes albopictus is a highly invasive mosquito species and a vector of human arboviral diseases including dengue, chikungunya, and Zika. There are no effective drugs or vaccines for the treatment or prevention of most of these diseases, so the primary option for disease prevention and control is to target mosquitoes, often using insecticides. Despite vector control efforts, cases of arboviral diseases are increasing in Bangladesh and it is important to understand if this escalation is associated with the presence of insecticide resistance in Aedes populations, including Ae. albopictus. The CDC bottle bioassays performed on Ae. albopictus from two districts in Bangladesh detected resistance to permethrin but susceptibility to deltamethrin, malathion, and bendiocarb. The detection of permethrin resistance is worrisome, since arbovirus vector control strategies in Bangladesh currently include the use of permethrin. Routine monitoring of the susceptibility status of key vector populations in Bangladesh will allow a better understanding of resistance trends, enabling the strengthening of control strategies.

scholarly journals Effects of Color and Perforated Lid on Ovitrap Preference of Aedes aegypti and Aedes albopictus

2020 ◽  
Vol 36 (4) ◽  
pp. 240-244
Author(s):  
Takashi Tsunoda ◽  
Dung Thi Nguyen ◽  
Trang Vi Quynh
Keyword(s):  
Aedes Aegypti ◽  
Aedes Albopictus ◽  
Mosquito Species ◽  
Oviposition Preference ◽  
Sampling Efficiency ◽  
Aedes Mosquito ◽  
Mosquito Surveillance ◽  
And Control

ABSTRACT The shape and color of an ovitrap affect the sampling efficiency of mosquitoes. We examined the effect of perforated lids of different colored cups on the preference of Aedes aegypti and Ae. albopictus for oviposition containers. The mosquito species were collected from Tuy Hoa City, Phu Yen Province, Vietnam in April 2016. Females of both species laid eggs in cups without a lid in the order of black, red, and green. However, the number of eggs laid by both species was not different between the black cups with a perforated lid and those without a lid. Aedes aegypti females laid more eggs in red cups with a perforated lid than cups without a lid. Green cups with a perforated lid were not preferred by Ae. aegypti and Ae. albopictus. Our results showed that the effect of perforated lids on oviposition preference was dependent on cup color and that it differed between the mosquito species. Out study provides valuable insights for the development of more effective ovitraps for Aedes mosquito surveillance and control.

scholarly journals Sugar prevalence in Aedes albopictus differs by habitat, sex and time of day on Masig Island, Torres Strait, Australia

2021 ◽  
Vol 14 (1) ◽  
Author(s):  
T. Swan ◽  
E. Ritmejerytė ◽  
B. Sebayang ◽  
R. Jones ◽  
G. Devine ◽  
...  
Keyword(s):  
Aedes Albopictus ◽  
Feeding Behaviour ◽  
Significant Interaction ◽  
Mosquito Species ◽  
Time Of Day ◽  
Essential Information ◽  
Sugar Feeding ◽  
Baseline Information ◽  
Torres Strait ◽  
And Control

Abstract Background Sugar feeding is a fundamental behaviour of many mosquito species. For Aedes albopictus, an important vector of dengue virus and chikungunya virus, little is known about its sugar-feeding behaviour, and no studies have been conducted on this in the southern hemisphere. This knowledge is pivotal for determining the potential of attractive targeted sugar baits (ATSBs) to control this important vector. Methods The prevalence of sugar was assessed in 1808 Ae. albopictus from Masig Island, Torres Strait, Australia collected between 13 and 25 March 2020. Fructose presence and content in field-collected Ae. albopictus were quantified using the cold anthrone assay. Results Significantly more male (35.8%) than female (28.4%) Ae. albopictus were sugar fed. There was a significant interaction between sex and time of day on the probability of capturing sugar-fed Ae. albopictus. For both sexes, fructose prevalence and content were higher in mosquitoes caught in the morning than in the afternoon. Female Ae. albopictus collected in the residential habitat were significantly more likely to be sugar fed than those collected in the woodland habitat. Conclusions These findings provide baseline information about the sugar-feeding patterns of Ae. albopictus and provide essential information to enable an assessment of the potential of ATSBs for vector suppression and control on Masig Island, with relevance to other locations where this species occurs. Graphical abstract

Monitoring global public health threat - surveillance of Aedes (Stegomyia) mosquitoes in new Mangalore sea port, India

ENTOMON ◽  
2019 ◽  
Vol 44 (1) ◽  
pp. 15-22
Author(s):  
R. Rajendran ◽  
K. Regu ◽  
J.M. Kurian
Keyword(s):  
Mosquito Species ◽  
International Health ◽  
Global Public Health ◽  
Vector Surveillance ◽  
Entomological Surveillance ◽  
Port Area ◽  
Mosquito Breeding ◽  
And Control ◽  
Health Regulations ◽  
Water Holding

Vector surveillance and control at port of entry (PoE) is an essential activity for the implementation of International Health Regulations (IHR). The present study was undertaken in and around New Mangalore sea port. Inside the port area, a total of 13 water holding containers at 33 premises were checked and no containers were found positive for larval breeding. In the residential area, 132 water holding containers were checked in 100 houses. The breeding preference ratio was highest for earthen containers (18.8) followed by grinding stone (4.72), metal (1.72), cement tank (1.62) and plastic (0.24). The House index, Container index and Breteau index were found to be 7.0, 5.3 and 7.0% respectively. The nearness of residential colony to NMPT, consequently enhances the chances of spreading of Aedes mosquitoes in the port area. From the present study it is evident that inside the sea port there are ample habitats for the mosquitoes to breed and thrive in rainy season. Routine entomological surveillance is required not only to monitor the mosquito breeding in and around port area but also to prevent transportation and establishment of mosquito species in newer areas.

Attraction of the Mosquitoes Aedes aegypti and Aedes albopictus (Diptera: Culicidae) to a 3-Part Phytochemical Blend in a Mesocosm

2021 ◽  
Author(s):  
Robert P Hutcheson ◽  
Babak Ebrahimi ◽  
Basilio N Njiru ◽  
Woodbridge A Foster ◽  
William Jany
Keyword(s):  
Aedes Aegypti ◽  
Aedes Albopictus ◽  
Mosquito Species ◽  
Population Surveillance ◽  
Anopheline Mosquito ◽  
Blend Ratio ◽  
Aedes Mosquitoes ◽  
And Control ◽  
Trap Catches ◽  
Ratio Of Components

Abstract Aedes aegypti (L.) and Aedes albopictus (Skuse) mosquitoes of both sexes were attracted to a 3-part volatile synthetic phytochemical blend but differed according to their component ratios, 7:3:2 or 1:1:1, and their initial concentrations. These arbovirus vectors were presented with the blends as baits in paired baited and blank CFG traps in a large greenhouse mesocosm. Ae. aegypti attraction was highest at a 7:3:2 blend ratio, but at a concentration half that found most effective for an anopheline mosquito species in outdoor screenhouses. Both lower and higher concentrations yielded substantially lower attraction scores for Ae. aegypti. By contrast, the few tests conducted on Ae. albopictus showed that it was not as sensitive to concentration, but again it was more responsive to the 7:3:2 ratio of components than to the 1:1:1 ratio. The two sexes of both species were represented equally in the trap catches, indicating the potential value of this and similar attractive blends for population surveillance and control of Aedes mosquitoes.

scholarly journals A Survey of Mosquito Species in Public Schools of Metro Manila, Philippines Using Ovitraps as Surveillance Tool

2019 ◽  
Vol 53 (4) ◽  
Author(s):  
Myra S. Mistica ◽  
Virginia R. Ocampo ◽  
Lilian A. De Las Llagas ◽  
Arlene G. Bertuso ◽  
Fe D. Alzona ◽  
...  
Keyword(s):  
Public Schools ◽  
Aedes Aegypti ◽  
Aedes Albopictus ◽  
Mosquito Species ◽  
Mosquito Larvae ◽  
Vector Surveillance ◽  
Metro Manila ◽  
Larval Emergence ◽  
Eggs And Larvae ◽  
Type Of School

Objective. This study assessed the species composition of mosquitoes collected from ovitraps in selected public schools of Metro Manila, Philippines. Materials and Methods. Ovitraps were installed from November 2013 to February 2014, in purposively selected public elementary and high schools of Metro Manila. Ovitraps were installed inside classrooms and collected weekly and examined for mosquito eggs and larvae. Speciation was done once a month from November 2013 to February 2014. All positive paddles were immersed in water for larval emergence, reared to fourth instars and were identified using taxonomic keys. Results. A total of 1,482 ovitraps were installed in the selected public schools, and 18,325 larvae were collected from elementary schools, while 16,670 larvae were collected from high schools.The mean ovitrap index or infestation rate was 49.69% during the period of data collection. Mosquito larvae were identified as Aedes aegypti (88.94%) and Aedes albopictus (11.06%). Aedes aegypti and Aedes albopictus coexisted in some of the examined paddles. No significant differences were observed between the type of school and the presence of Aedes larvae. Significant differences were observed between total number of mosquito larvae and months of collection. Conclusion. The presence of Aedes mosquitoes in schools evidently shows that continuous vector surveillance in schools is necessary as this information will help in the formulation of proactive vector control activities, thereby preventing the occurrence of mosquito-borne diseases.

Residual Gas Reaction in the Electron Microscope: II The Design of a Gas-Control Chamber for Quantitative Observations

1969 ◽  
Vol 27 ◽  
pp. 82-83
Author(s):  
Chester J. Calbick ◽  
Richard E. Hartman
Keyword(s):  
Electron Beam ◽  
Electron Microscope ◽  
Local Environment ◽  
Chamber Pressure ◽  
Objective Lens ◽  
Ion Pump ◽  
Quantitative Studies ◽  
Precise Knowledge ◽  
Differential Pumping ◽  
And Control

Quantitative studies of the phenomenon associated with reactions induced by the electron beam between specimens and gases present in the electron microscope require precise knowledge and control of the local environment experienced by the portion of the specimen in the electron beam. Because of outgassing phenomena, the environment at the irradiated portion of the specimen is very different from that in any place where gas pressures and compositions can be measured. We have found that differential pumping of the specimen chamber by a 4" Orb-Ion pump, following roughing by a zeolite sorption pump, can produce a specimen-chamber pressure 100- to 1000-fold less than that in the region below the objective lens.

A Simple PCR Assay for Discrimination of Dengue Vectors from Nsukka LGA, Nigeria

2020 ◽  
Vol 10 (1) ◽  
pp. 67-77
Author(s):  
Amos Watentena ◽  
Ikem Chris Okoye ◽  
Ikechukwu Eugene Onah ◽  
Onwude Cosmas Ogbonnaya ◽  
Emmanuel Ogudu
Keyword(s):  
Aedes Aegypti ◽  
Aedes Albopictus ◽  
Mosquito Species ◽  
Public Health Problem ◽  
Major Public Health Problem ◽  
Mosquito Vector ◽  
Aedes Mosquitoes ◽  
Allele Specific ◽  
Arboviral Diseases ◽  
Dengue Vectors

Mosquitoes of Aedes species are vectors of several arboviral diseases which continue to be a major public health problem in Nigeria. This study among other things, morphologically identified Aedes mosquitoes collected from Nsukka LGA and used an allele specific PCR amplification for discrimination of dengue vectors. Larval sampling, BG-sentinel traps and modified human landing catches were used for mosquito sampling in two selected autonomous communities of Nsukka LGA (Nsukka and Obimo). A total of 124 Aedes mosquitoes consisting of five (5) different species were collected from April to June, 2019 in a cross-sectional study that covered 126 households, under 76 distinct geographical coordinates. Larvae was mainly collected from plastic containers 73% (n=224), metallic containers 14% (n=43), earthen pots 9% (n=29) and used car tyres 3% (n=9), reared to adult stage 69.35% (n=86), and all mosquitoes were identified using standard morphological keys. Five (5) Aedes mosquito species were captured; Aedes aegypti 83(66.94%), Aedes albopictus 33(26.61%), Aedes simpsoni (4.48%), Aedes luteocephalus (≤1%) and Aedes vittatus (≤1%). Nsukka autonomous community had higher species diversity than Obimo. Allele specific amplification confirmed dengue vectors, Aedes aegypti and Aedes albopictus species on a 2% agarose gel. Since the most recent re-emergence of arboviral diseases is closely associated with Aedes species, findings of this study, therefore, give further evidence about the presence of potential arboviral vectors in Nigeria and describe the role of a simple PCR in discriminating some. Further entomological studies should integrate PCR assays in mosquito vector surveillance.

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