Assessing the presence of Wuchereria bancrofti in vector and human populations from urban communities in Conakry, Guinea

Kouassi, Bernard L.; Souza, Dziedzom K. de; Goépogui, Andre; Narh, Charles A.; King, Sandra A.; Mamadou, Baldé S.; Diakité, Lamia; Dadzie, Samuel; Boakye, Daniel; Utzinger, Jürg; Bockarie, Moses J.; Koudou, Benjamin G.

doi:10.1186/s13071-015-1077-x

Cited by 33 publications

(41 citation statements)

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“…p. pipiens and Er. intermedius have not been reported in Guinea [14,15,18,19,21]. The identification of these species, in addition to the potential presence of Cx.…”

Section: Discussionmentioning

confidence: 99%

“…Major outbreaks of human diseases include a yellow fever virus (YFV) outbreak in 2000 [13] where Aedes aegypti, the major YFV vector in urban areas, was not found in the rural areas [13], suggesting other mosquito species were likely involved in transmission. Despite significant transmission of malaria, lymphatic filariasis and sporadic outbreaks of arboviruses, relatively few medical entomological studies to date have been undertaken in Guinea [14][15][16][17][18][19][20][21][22]. Therefore, there is a need to undertake entomological surveys using diverse collection methods to determine the most appropriate mosquito trapping methods to use for surveillance.…”

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confidence: 99%

“…We compared the performance of five adult trapping methods to determine mosquito species abundance and diversity in Maferinyah sub-prefecture, Guinea, and provide evidence towards the most suitable trap for surveillance. To our knowledge, only larval collections, pyrethroid spray catches, exit traps, aspirators, HLCs and LT have been used in Guinea to collect mosquitoes [16,19,[22][23][24]. In this study, we selected gravid traps (GT), Stealth traps (ST), LT and BG sentinel 2 traps (BG2T) with two different lures (BG and MB5) in comparison with HLCs to test new trapping methods not previously used in Guinea to capture the highest diversity of mosquito species.…”

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An assessment of adult mosquito collection techniques for studying species abundance and diversity in Maferinyah, Guinea

et al. 2020

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Background: Several mosquito collection methods are routinely used in vector control programmes. However, they target different behaviours causing bias in estimation of species diversity and abundance. Given the paucity of mosquito trap data in West Africa, we compared the performance of five trap-lure combinations and Human Landing Catches (HLCs) in Guinea. Methods: CDC light traps (LT), BG sentinel 2 traps (BG2T), gravid traps (GT) and Stealth traps (ST) were compared in a 5 × 5 Latin Square design in three villages in Guinea between June and July 2018. The ST, a portable trap which performs similarly to a LT but incorporates LEDs and incandescent light, was included since it has not been widely tested. BG2T were used with BG and MB5 lures instead of CO 2 to test the efficacy of these attractants. HLCs were performed for 5 nights, but not as part of the Latin Square. A Generalised Linear Mixed Model was applied to compare the effect of the traps, sites and collection times on mosquito abundance. Species identification was confirmed using PCR-based analysis and Sanger sequencing. Results: A total of 10,610 mosquitoes were captured across five traps. ST collected significantly more mosquitoes (7096) than the rest of the traps, but resulted in a higher number of damaged specimens. ST and BG2T collected the highest numbers of Anopheles gambiae (s.l.) and Aedes aegypti mosquitoes, respectively. HLCs captured predominantly An. coluzzii (41%) and hybrids of An. gambiae and An. coluzzii (36%) in contrast to the five traps, which captured predominantly An. melas (83%). The rural site (Senguelen) presented the highest abundance of mosquitoes and overall diversity in comparison with Fandie (semi-rural) and Maferinyah Centre I (semi-urban). Our results confirm the presence of four species for the first time in Guinea. Conclusions: ST collected the highest number of mosquitoes suggesting this trap may play an important role for mosquito surveillance in Guinea and similar sites in West Africa. We recommend the incorporation of molecular tools in entomological studies since they have helped to identify 25 mosquito species in this area.

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“…p. pipiens and Er. intermedius have not been reported in Guinea [14,15,18,19,21]. The identification of these species, in addition to the potential presence of Cx.…”

Section: Discussionmentioning

confidence: 99%

mentioning

confidence: 99%

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confidence: 99%

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An assessment of adult mosquito collection techniques for studying species abundance and diversity in Maferinyah, Guinea

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“…gambiae complex with opportunistic feeding behaviours, whereas HLCs were shown to preferentially collect anthropophilic species, demonstrating HLCs may still provide the optimal way to collect primary malaria vectors. However, the ST collected the largest number of mosquitoes and also the largest number of different species (19) across the three study sites, indicating it has beneficial properties for mosquito surveillance, in Guinea and similar sites in West Africa, to provide important entomological data on diverse mosquito populations. Due to the damage that this trap causes to the specimens, its performance could be optimised when used in shorter collection intervals and / or when sufficiently protected from adverse weather.…”

Section: Discussionmentioning

confidence: 99%

“…We compared the performance of several adult trapping methods to determine both mosquito species abundance and diversity in Maferinyah sub-prefecture, Guinea. To our knowledge, only larval collections, pyrethroid spray catches, exit traps, aspirators, HLCs and CDC light traps have been used in Guinea to collect mosquitoes (16,19,22–24). Thus, we selected gravid traps, Stealth traps and CDC light traps, and BG sentinel 2 traps with two different lures (BG and MB5) in comparison with HLCs to capture the highest diversity of mosquito species.…”

Section: Introductionmentioning

confidence: 99%

An assessment of adult mosquito collection techniques for studying species abundance and diversity in Maferinyah, Guinea

Cansado-Utrilla

Jeffries

Kristan

et al. 2019

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24Background: Guinea is a West African country with a high prevalence of vector-borne 25 diseases where few entomological studies have been undertaken. Although several 26 mosquito collection methods are routinely used for surveillance in vector control 27 programmes, they target different behaviours causing bias in species diversity and 28 abundance. Given the paucity of mosquito trap data in West Africa, we compared the 29 performance of five trap-lure combinations and Human Landing Catches (HLCs) in Guinea. 30 Methods: Five mosquito traps were compared in a 5x5 Latin Square design for 15 days in 31 three villages in Guinea between June and July 2018. CDC light traps, BG sentinel 2 traps 32 (with BG and MB5 lures), gravid traps and Stealth traps were deployed for 24-hour intervals 33 with mosquitoes collected every 12 hours (day and night collections). HLCs were also 34 performed for 15 nights. A Generalised Linear Mixed Model was applied to compare the 35 effect of the traps, sites and collection times on the mosquito abundance. Species 36 identification was confirmed using PCR-based analysis and Sanger sequencing. 37Results: In total, 10,610 mosquitoes were captured across all five traps. Significantly more 38 mosquitoes (P<0.005) were collected by Stealth traps (7,096) compared to the rest of the 39 traps. Stealth traps and BG sentinel 2 traps were the best at capturing An. gambiae and Ae. 40 aegypti mosquitoes respectively. HLCs captured predominantly An. coluzzii (41%) and 41 hybrids of An. gambiae s.s. / An. coluzzii (36%) in contrast to the five adult traps, which 42 captured predominantly An. melas (83%). Senguelen (rural) presented the highest 43 abundance of mosquitoes and overall diversity in comparison with Fandie (semi-rural) and 44 Maferinyah Centre One (semi-urban). To our knowledge, four species are reported for the 45 first time in Guinea. 46Conclusions: Stealth traps presented the best performance overall, suggesting that this trap 47 has helped to reveal, together with morphological identification, the presence of 25 mosquito 50 species in this area. 51 BACKGROUND 53Control programmes which target malaria and other vector-borne diseases need to be 54 specific to the country or region in which they are implemented. In order to choose the best 55 intervention(s), it is essential to know which mosquito species are both present, and 56 transmitting human pathogens in a given area. For example, the primary vectors of malaria 57in Africa display primarily endophagic and endophilic behaviour and therefore can be 58 targeted by interventions such as Indoor Residual Spraying (IRS) or through the use of 59Long-Lasting Insecticidal Nets (LLINs). Despite primary vectors contributing to the majority 60 of the transmission of mosquito-borne diseases, secondary vector species can play an 61 essential role in maintaining residual transmission (1). However, secondary malaria vectors 62 that display exophagic and/or exophilic behaviour may not be affected by interventions 63 foused on the primary vectors. ...

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Perceptions, knowledge, attitudes and practices for the prevention and control of lymphatic filariasis in Conakry, Republic of Guinea

et al. 2018

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Little is known about the perceptions, attitudes and practices of lymphatic filariasis in Conakry, Republic of Guinea. Yet, such knowledge is important for an optimal design and implementation of setting-specific prevention and control measures. We conducted a cross-sectional study using a mixed methods approach. Qualitative data related to people's general experience with lymphatic filariasis, their perception of the causes of the disease, the onset of elephantiasis, care-seeking behaviour and the socioeconomic impact of lymphatic filariasis were collected through in-depth interviews with 85 respondents. Quantitative data related to strategies for prevention and the knowledge of the causes of the disease were collected by interviewing 429 people. A total of 514 individuals (313 females and 201 males), aged 10-84 years, participated. Most participants were well aware of lymphatic filariasis and they recognized the disease mainly by its disfiguring manifestation, collectively termed "elephantiasis" or "leg-swelling disease". Morbidity patterns due to filarial infection showed an increase with age (from 30 to 50 years) independent of sex. Most patients with lymphatic filariasis abandoned their jobs (73.9%) or sought other work (21.7%). The main perceived causes of acquiring lymphatic filariasis were of supernatural origin (as stated by 8.7% of patients and 5.7% of healthy subjects), while mosquito bites were mentioned by fewer participants (4.3% of patients and 4.2% of healthy subjects). A number of other causes were reported that relate to both medical and non-medical conceptions. The study also identified socioeconomic impairments and stigmatization due to elephantiasis. Taken together, community perception of lymphatic filariasis in Conakry is influenced by sociocultural conceptions. Appropriate health education campaigns aimed at enhancing community understanding of the transmission of lymphatic filariasis are required to increase the success of mass drug administration implemented for the elimination of this disease. There is a need for a morbidity management programme to alleviate lymphatic filariasis-related physical and emotional burden in Conakry.

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Assessing the presence of Wuchereria bancrofti in vector and human populations from urban communities in Conakry, Guinea

Cited by 33 publications

References 42 publications

An assessment of adult mosquito collection techniques for studying species abundance and diversity in Maferinyah, Guinea

An assessment of adult mosquito collection techniques for studying species abundance and diversity in Maferinyah, Guinea

An assessment of adult mosquito collection techniques for studying species abundance and diversity in Maferinyah, Guinea

Perceptions, knowledge, attitudes and practices for the prevention and control of lymphatic filariasis in Conakry, Republic of Guinea

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